Hi,
French canadian here, I usually play the french version but on NA East Coast US. I really dont want to play on european server for two reason; 1) ping and 2) Peak time.
If I were playing on european server, it would be night for them during my play time on my evening. It would make queue up for FP and other stuff really hard. The thing too is that, most french canadian speak and/or understand english properly so I dont mind playing with the client in french, but speaking with other in english. Since I can Click Shift quest and item, I can keep up with quest name and items people talk about.
I've tried too the english client, both are really good, for sure you can hear that the quality of the english dialogues are better, but the french version is still very good and it's superior to all other MMO that has a french version and that I tried.
I hope I am clear, as you can guess, english is not my first language !