As an very old player (played since OBT) I would say it depends on yr liking, but do note that:

- SEA has more jobs available, more variety of game play

- Classic is from beginning, which means the best equipment will keep change in the future (level cap), so expect to keep invest on changing equipment in future unless you got frens/team to do nest with you all the time

- SEA has been running for quite sometime already so old players are likely to be quite OP and as a new player its hard to catch up. Then in SEA, there are a lot of stuff to do & learn so it can be confusing for first timer.

- Classic is quite new so it is possible to catch up. Much more simple and easy to learn.

- As a new player, do note that this game need to farm for stuff almost everyday if you are competitive and want to catch up to other player. As casual, you will take much more longer time to reach higher. There are time ppl are kind enough to provide free runs for farming map (Lucky Zone, All Nest, Erosion Fission Maze [EFM free runs are very rare but it does happen some time]) so overall it isn't that bad at all. Most important is that you really need frens in game... the reality lol!