I suggest taking them all. Fees could somewhat change, so this will not matter a lot of what stables coin to accept but have to think the needs of your client and I think they are certainly looking for more possible options, not just one.
You can never tell which stable coins have a higher demand unless if you try them. In fact, you can disable any of them if you think it was not really needed. What I wanted to tell is that it needs some trials just to find out if that really works or not, or to have additional options.