[Uleat]

Regardless of client, if you play on a peqdb-based server, you will only receive playable content up to Gates of Discord.

Custom servers may provide more..or some even restrict their expansion content. You should check a given server's website to see if there's a restriction
on the clients that they allow to connect to their server. Otherwise, any of the supported client should suffice.

The biggest discernment between clients, at the moment, is features.