This guy has some "side-by-side" reviews of WSS ranges, and it is also a good site for WSS wargaming stuff generally:-
http://steve-the-wargamer-wss.blogspot.com/
Some further suggestions for figures:-
Black Hat's new range; compatible with Dixon/Roundway -
http://www.blackhat.co.uk/online_shop/i ... 5da61f9f8d
Donnington has 6 or 7 ranges covering ECW/TYW through to 1700 -
http://shop.ancient-modern.co.uk/warfar ... y-19-c.asp
Peter Pig are a little on the small side, though a bit bigger than Hallmark. Minifigs are a little taller than Dixon, but not as big as Venexia etc (oddly, Minifigs horses are larger than Dixon, but rider and horse together look smaller than Dixon cavalry). Don't completely discount Hallmark as they do lovely wagons etc and odd items, such as roadside crosses, which are ideal for "landscaping" your battlefield (if you're into that sort of thing).
On the subject of wagons, Museum Miniatures are superb; they also do some useful extras, such as fences, religious figures, etc:
http://www.museumminiatures.co.uk/
(search for "Equipment" in the scroll-down menu at the very bottom right of the home page)