rebate trading questions

I used to trade listed, and now plan to start trading nasdaq and ETF (AMEX).
Suppose ARCA, BRUT, ISLAND all have the same offers, and if I like to join the offer, where should I route my limit order? Should I join the one with the largest size or smallest?
Do they give you the same rebate?
Do they offer rebate for ETF such as SPY, DIA and QQQQ?
 
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