I've found that the D'Addarios have just a little more tension to them than the Sunbeams. The DR's also have a smoother feel to them, IMO (easier on my fingers). Both have nice tone to them, though (with the Sunbeams having a slightly warmer tone overall).
I used D'Addario XL's for years & years (they're a really great string, too) until I tried a set of Sunbeams - now they're my favorite rounds for sure!
I say pick up a set & give 'em a shot. If you don't like 'em you can always go back to your trusty XL's!
Good luck!