Well, Cyril Chocolat is my favorite ; it's a familial artisan (actually, it's held but my uncle, so I'm not very neutral XD), and at least it really tastes like chocolate.
Nice to know, bookmarked.
(You might have guessed I prefer super dark chocolate. 8D)
Well, that's the real chocolate...
Galler is a big enterprise and their chocolate is ok ; but as counterexample, Darcis chocolate, which is as famous as Galler here, is totally awful. Leonidas is quite big now too, and seems more world-spread than the 2 others, and their chocolate is ok but way too expansive.
Leonidas opened various stores even here in Italy. I tried the one in Treviso, but for what I recall from my last visit in Belgium (more than 10 years ago) the quality is quite worse than the ones I tasted in Charleroi (but probably I'm wrong). I think their only praline worth trying is the signature one coffee-hazelnut-whitechocolate, mainly for historical reasons.
But I don't like as some chocolate enterprises put all their efforts on design instead of taste, now you've got pretty pralines that tastes like plastic. >__<
This is the general problem of modern pastry, people care more about design and marketing than taste. Unfortunately.
What are you favorite chocolatiers ? ^^ (Maybe you could paradoxically make me discover some !)
As I wrote above, my last visit in Belgium was many years ago, so my memory can fail and things can have changed quite a lot. So I can't give much opinions about taste of what I tried in Charleroi, Namur and Bruxelles, it would not be wise since I don't have recent experiences. I have some knowledge from professional books and magazines.
First names that come to mind are the famous ones (I should surf through my bookmarks to look for other names):
As I said I'm talking mainly from what I read on books and magazines, I really like their recipes and their flavour combinations. But as you pointed out, things can vary a lot from the written recipe to the real stuff you buy in the shops.