Kathy, I think I might have a Moen side-sprayer but its an el-cheapo model. Got it about 14 1/2 years ago and the faucet doesn't want to stay in place when I rotate it (it springs back) and the diverter for the sprayer is no longer working properly (it keeps coming out of the other faucet and makes the water to the sprayer weaker). The water pressure from it was fine until we had an issue with the water pump from our well system. I probably need to dismantle it, replace some washers, clean out sediment, and then put it back on.
The fact that a cheap model has lasted as long as this one is a sign that they are built pretty well. I would hope the higher end ones would be sturdier.
It's not a particularly attractive faucet. Just a regular stainless steel generic looking one.
I think a pull-out one might be easier to work with than a side-sprayer, although the side-sprayer is designed to fit in your hand.
I don't think a plastic sprayer would have any less water pressure/ flow than a metal one.