Both of those balls are really good, the Marvel Pearl a bit better as lanes transition and start hooking more, the IQ Tour is awesome on the fresh and staying out of trouble.
But bigger question I have, are either of those two that different than the other two balls in your bag? I'd probably be looking at something even weaker for when lanes really start hooking instead, but if you just bowl league in a house that's consistent, you probably don't need that piece.