i am a scalper (target+1,+2+3) and i am reading the jigsaw dom(because has bid$ask market orders &cum delta & reconT&S ,and executing trough jigsaw (i has the limitation of no bracket orders) or with a dom side by side (limitation to watch 2 things)
I need to find a solution/execution platform to help me to execute quick and reliable
and also a low cost broker

Do you think I can notice difference (good fills, speed,reliability, execution, etc..)between execute trades trough the this differents brokers/platforms:

Jigsaw+OEC (i can try this)
Mirus/zenfire/Dorman (i can try this)
S5+OEC (now i have this)
Jigsaw+NT/AMP
Infinity DOM+Transact (now i have this)
Tradestation (now i have this)
Xtrader/AMP
CTS4 i/advantage or other broker

thanks you very much

Any difference between those will almost certainly be offset by your proximity (lack of) to the exchange, since you are in Spain.

Mike