There is a lot of different between YU-GI-OH Online and YU-GI-OH Online Duel Evolution.
1.Avatar System.You can creat character/choose Avatar.Character/Avatar you choose will show up on Duel Screen and when other click on you
2.Map System.There is a Place/Map that you can walk around diferrent from the past that like this.
and in YU-GI-OH Online Duel evolution you have your own room too.
There is 2 Main Server in this game Domino City and Duel Academy.Blue door is Domino City Red door is Duel Academy.Event in this game will hold in a different place for example Gunslinger and Championship will be on Domino City while Duel Academy have a Duelist Trial.
3.Deck Construction/Edit Deck and Trade Screen is a lot diferrent than before.Structure Deck menu is add on for you to load a Structure Deck you got from Duel Pass.
In the past
4.Status of your Character.They add more status of your Character.
Player Names are shown in various colours on both the map screen and the player list. Check below to see what they mean.
5.Chat Screen.In the past you can creat Chat Room for now you can’t but you can sent a Private Message/Private Chat with other by click on him select Chat Message and type your message or typing /player name and Type your message only the one you select can see your message.Private Message is a text in Pink color and Now while you are Dueling/Trading you can see All Chat in lobby (in the past you can’t).
They Seperate a Chat into 4 Tab you can switch it by click on it.
All Chat : Show All Chat in The Map
Proximity Chat : Only shows chat between users who are in your immediate surroundings.
Trade : They creat it for trading but not many people using it They use All Chat to trade/offer cards
Trade Partner : This Tab will appear only when you trade.It’s private chat between you and trade partner can see it
6.Duel Option.It was add for Player to customize a message display/asking in Duel Screen
Auto Tracking : Auto Target For Example when you Attack if this is on you can’t select a monster on your opponent that you want to attack it.It is auto target.If this is off you can choose an opponent monster to attack
Auto Card Placing : You can choose where you will put your card/token in Monster Zone/Trap Card Zone at Duel Screen.It’s good for Prevent some cards like Rampaging Rhynos,Storm Shooter and other
Activation Message : Choose what you want it to display/asking when you activate Magic/Trap/Chain
Auto Cancel : It’s Auto Cancel there will not have much message asking you to activate Magic/Trap/Monster Effect/Chain/ not recommend for everyone except your deck don’t need to Chain
Semi Auto Cancel : Recommend Option for Everyone.It will asking you for activating Magic/Trap/Monster Effect/Chain not so much Annoy like Manual.if you want to activate Cards at Chain Link 2 or more hold a left click message will display and asking you like Manual for Auto Cancel hold right click
Manual : It’s so much annoy.It will ask you every step and asking Do you want to check a field? but you can chain without problem every message will display and asking you.
You can Customize your Duel Option at Duel Screen by clicking on Tool Icon at bottom left at Duel Screen.
7.More function was add on Lobby like Creat Comment,Go to the same area, and for now you can creat Match Auto Duel that you can’t in the past for more Detail you can look it at. http://www.yugioh-online.net/top/english/game/manual.html#
8.Cards Image and Booster.
Card Image is more brighter than before
For Booster/Packs.Now It’s have Pack Completion Rate for player/Collecttor to see How Many Cards you collect at those pack.In The Past you need to check it by yourself.
9.Resolution.YU-GI-OH Online Duel Evolution will run at 1024/768 while the old version run at 800/600 this is a reason why you see Cards Picture is smaller than before but normally it’s not Card Image are the same resolution but this game run on 1024/768 make you see it smaller.
While you will activate Magic/Trap/Monster Effect you can see a Picture of it too In The Past you can’t only message display.
10.BGM (Background Music) or Soundtrack is new and when you use Field Spell Card BGM will change depending on what field Spell Card.
11.D-Mail and Mileage are Available now, It’s also upgrade D-Mail is like when you are writing E-mail to someone on Hotmail.com and Mileage System got major change to Card Shop/Card Store that player can buy Cards/Packs, Avatar Item such as Cloth, Duel Disk
12.Duel Logs is Upgrade it’s split into Duel Log Collection and Latest Duel Log, Latest Duel Logs show your last 100 duel while Duel Log Collection are unlimit depend on how much you add Duel Log to your collection and Now you can see Duel Log from YU-GI-OH Online Championship Final Tournament too.
13.Tournament Point Ranking and Event is Upgrade if you have 100 TP you also get 1 card you chose if you are at Top 1000 Tournament Point Ranking you can choose your cards again.
14.New System NPC are available now, You can duel and get cards/Avatar Part/Deck Recipe from NPC.
For More Information can read about it at
https://duelevolution.wordpress.com/npc/, https://duelevolution.wordpress.com/2007/09/07/npc-duels/, http://www.yugioh-online.net/top/english/cpu/index.html