I currently have two SWB recumbents; A Haluzak Horizon above seat steering (ASS) (was below seat last year) and a Challenge Distance ASS.
I have ridden LWB and I felt them a little twitchy in steering at low speeds but incredibly fast and comfortable at cruising speed. Your feet are usually below your hip line while on the peddles.
The problem of having the feet at hip height or higher is that you feet do go numb after awhile do lack of circulation which does not happen in the LWB style as much. Can be darn cold on feet in winter.
There is another thing I find I suffer from is "recumbent butt' which is the bum goes numb after say 80+km. Just get off the bike and walk around to get the circulation working again helps.
If you get a chance find out if there is a group of recumbent riders around you can ride with and try out their bikes that way you can possibly save an expensive wrong purchase.