Usually it is recommended to check which features you want/need, and which nemo patches you may want to use, after that, just pick a client that matches your needs.
For example, anything newer than 2019-06 would have the new guild emblems which is not implemented, so you may want to go with a previous date to have guild emblems. But if you want rodex, you would need at least 2015-05 or something around that. Another thing to consider are which nemo patches you may want to apply, as some won't work for some client dates.
Unfortunately there's no list of features/client date, but for patches you may check nemo.herc.ws