I've never owned either bike, and never ridden the F650, but if you scroll down to "Road Warriors" and find the thread...aww heck. here it is http://www.advrider.com/forums/showthread.php?t=851287
"the most boring bike you've ever ridden" Suzuki DL (both 1000 and 650) top the list. Reliable? Absolutely! Fun? Well...it is a motorcycle, but there's a lot more to riding than infrequent valve service, and you have to take the Strom in half to adjust the valves.
Compared to the F650 ( I HAVE sat on one, just not ridden one) the DL is top heavy. A 5 mile test ride on the WeeStrom was enough for me