One app has delayed post. Love that with no info button. One seems to fail to post to multiple relays for me, but warns me with feedback. Another makes posts with images more prominent. Another makes long notes more visible. Some treat zaps and reactions differently. One allows many reactions one just single reaction. 

It would be nice if these were combined. Or if the libraries to accomplish some of these services were made available to implement like from some open source library so that people could assemble the client they like. Like a #NostrInnerSource community of devs or something.