I don’t have any problem with MM or ECN unless the broker is well regulated. I believe it is your trading style which is more important. I won’t go if that broker has no FCA regulation and well market reputation. No authority has the same degree of trust as FCA does!
It would be very tough to compare between ECN brokers by trading environment. Most of the ECN brokers offer lighting fast execution and no requote these days. However, I prefer ECN broker with lower commission for my Scalping. I switched to a ECN broker called Tickmill and I am happy so far.
Actually, I am a Price Action trader in daily chart but as you know market turmoil is very high recently. Nobody knows what Mr.Trump is going to do next with Syria and Russia. France election is playing vital role as Le Pen wants Frexit, OPEC is next and so much more.
I switched to my scalping strategy unless these changes and lower spread ECN is vital to scalp.