As far as the handicaps, they are not equal; I was an APA SL5 playing as a Tap SL3, competing against an APA SL6 who was a Tap SL4.
Usually SLs are one and more below from APA to TAP. In fact, when we switched, out TAP operator took our APA SLs and moved us down one to start with for out TAP league.
Don't forget the very useful and handy "Safe ball down" rule where you can call safe, pocket one of your own balls, and leave your opponent to shoot. Comes up a lot.
Nice thing about TAP is how easy it is to keep a team intact. I've been shooting APA with the same guys for years now, and NOBODY except for one player is a ringer in any sense of the word; nobody is going to sneak up on someone and blast them running racks. Yet, we still have a hard time fielding a team. It's frustrating with APA. TAP, never happens.
Plus...you avoid long nights...shorter races+better skilled shooters= a short and sweet night.