I use both the Silverfast SE Plus, and the Vuescan Pro product. Here's my take on the two packages.
I use them pretty much interchangeably - usually it's a matter of running into a set of images that I cannot GET the results I want with the one I am using, so I switch, and oddly enough that usually works. The scanning adjustments are pretty effective on both - with possibly a slight edge to Silverfast IMO. That's a matter of ease of use.
Both offer a fairly large list of Film Profiles for both color and black and white material. Perhaps a slight edge to LSSE here with the number of black and white film types they offer.
My advice: Vuescan Pro is an outstanding bargain. You buy the package, and you are assured of free updates for life. LSSE is the more expensive of the two, and is only good for the scanner you buy it for, and it produces excellent results. That said - I would recommend you get them both. I have used them both for the last 8 years and been very happy with them.
Good luck with the new scanner.