Here we go again ...
On the first page of this forum section are probably 7-8 threads about the same topic.
Most likely there are profitable traders with every broker, also on forums like these everyone seems to be profitable.
The best one for you depends on what you want/need. (Minimum deposit, leverage, ...)
Safest brokers are probably well regulated brokers.
I would think of Dukascopy, LCG, Activtrades, Darwinex, Baxter FX, .....
Plenty of good brokers around.