Can't choose which pool to be my primary pool.

miners-eu
most miners seem to use it, ~5% rejects

CryptoPoolMining
not so many miners, ~3% rejects

Both have a 1% fee and prop payout.

Now using miners-eu as primary pool and cryptopool as backup

I think it won't matter which I choose as primary, or will I make more KGC if I choose CryptoPool as primary due to lower rejects?
I have done a little comparing, and It looked like I got equally much KGC from both pools.