These get compared a lot, and mostly they shouldn't be. One gets people to the court; the other runs what happens after they arrive. Here is the job-by-job breakdown so you can tell which problem you actually have.
We build Pickle IQ, so read the table with that in mind — we have tried to be accurate about where the other tool is simply better.
Playtime Scheduler answers "who is coming Thursday?" — and in most US metros, it is where your players already are.
Pickle IQ answers "fourteen people just showed up on three courts — now what?"
This is what we would actually recommend for an established group: keep posting sessions wherever your members already look, then open Pickle IQ when you get to the court. Add the players who turned up, generate the first round, and share the Player View link so everyone can see their own next match instead of crowding the whiteboard. Nothing has to be integrated for that to work — the two tools never need to talk to each other.