I use SteamPeak the most but it's honestly which platform you choose is dependent on preference. I enjoy SteemPeak for the aesthetic purposes but I think Busy is more functional since it gives you a notification each time you get a comment, reblog, mention, or a follower. Steemit seems to be the landing point for those who like the nostalgia I'm assuming. There's always the option of DLive or DTube to connect with your followers live but other than that I'm not too sure of other platforms that have a chat built into them.