I have watched Royal Tennis once and I have to say the scoring system is the most complex of any sport of which I can think.
Table Tennis is a lot of fun.
Badminton and Speedminton are cool too.
I have never played Squash, but I would like to some day.
Racquetball is not my thing. I played once beating someone who played frequently. Beginner’s luck I guess.
I have never played Soft Tennis or Paddle Tennis.