If you like swords and a non-P2W enviroment, go with Classic. Everyone has the same weapons (which is sword, bow, and bombs) to make it an equal playing field. Personally not my type but if you like LoZ, you'll feel nearly right at home with Classic.

If you like guns then try Era. Be warned though as most of the high tier guns are at a hefty price making the game P2W. You can work with jobs but the gralat payouts are so low. The community is also very toxic compared to the other Graal games. Besides all that, Era is my favorite server since I love 2d dual stick shooters and love online open world PvP.

Zone is..in a weird place right now. If you like futuristic shooters I say give it a try? But honestly Zone haven't been as good these past few months. It's supposed to be getting a tileset revamp but who knows when that's coming? Give it a try if you want but I'll prefer Era/Classic rn over Zone anyday until the server reaches the potential I wish it would reach.