To help answer your question I'm going to have to ask you this:
Do you plan on any modificaitons? i.e. stock, bbl, DBM's etc? There are a BUNCH of smiths that work on Remmys but I can't personally think of one who works on Browning (I don't own one which is probably why).
Both brands have strong followings & solid reputations, if you are going to buy if install a scope & go play it would be a coin tosser.... if you want to modify (don't we all?) the Sendero hands down.
Does anyone make a tapered base for Brownings??