Depends on what you're going for. If you're looking for a Belgian Pale, then noble style hops like Tettnang, Saaz, Hallertauer, Mt Hood, etc would all work fine. For a "Belgian IPA" style, then Centennial, Cascade, Amarillo would be nice.
If I had to pick just one hop alone, I'd go with Amarillo just because I find it has the citrus notes I like but with a bit more complexity than something like Cascade.
In general, I prefer to use at least 2 different types of hops for a bit more complexity. So if I were using pale malt plus a Belgian yeast, then I'd probably do a Belgian IPA with Chinook at 60, 15 minutes and maybe dry hopped and Cascade at 15, 5 and 0 minutes plus dry hopped. Of course, I love hops so if you ask me again in 10 minutes I might decide on CTZ/Willamette or Simcoe/Citra or Liberty/Centennial or Tettnang/Saaz...