To mine with a GPU that has an average 47MH/s hash, does it make sense to use this type of pool?
Would it make it more profitable?
Theoretically no, as I mentioned they all mine the same blockchains so they all have the same difficulty.
The differences are in the added features, some of them I mentioned. That's a subjective question so only
you can decide which are important to you.
The main difference with multipools is they choose which coin to mine. That can be a good thing or a bad thing, YMMV.