In terms of 'if you want to be seen, WTS is the place to be', there's some merit to post in the WTB forums.
Because there are many fewer WTB ads posted, the likelihood that one's ad will stay at or near the top of the page (or on the first page) is higher.
That said, in honesty I think the best case scenario is to list it as a with the title "WTT: [Item] (location if you only want to do local)". My personal pet peeve is opening a WTS/WTB and finding out it's only local to whatever region. (well, that and the necessity to bump a post to say 'Sold!' and close it, which just pushes it back to the top, completely unnecessary - you can lock it and update the first post and get the same effect without needlessly pushing other posts down).