Don't think they classify as beer (probably more as lager but still)
but for plain beer, I like Jupiler or Stella Artois best, Dislike Maes, never felt the need to taste Heineken since I once saw an old cartoon about it that summarized everyone's opinion on it (at elast the person I heard that were airing their opinion on heineken)
I also like the taste of cold Duvel (which means devil, but it only has 8.5%), I used to take bets as to whether I could down a glass in one go (they're pretty hard to drink in one go, there's one pub somwehere in flanders that offers tons of money if you can drink ten duvels in an hour, no one has succeeded so far) which enabled me to be pretty happy the entire evening on only one drink, since it goes straight to my head.
I also like lieftmans, although it's a damn shame it's hard to get from tap nowadays. It's cherrybeer, so 'girly beer' what guys here call lemonade ^o) But it has a good taste, bit bitter and with a hint of sweet cherries
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