My favourite rules for WSS are Barry Hilton's "Beneath the Lily Banners".
I've played several games with the new version 2, and it plays very well. Initially the sequence seems a little complex, but by second game & third check of book all flowed very nicely. The 2 QRF sheets rapidly become all you need to play. The 2nd edition is a lot clearer & more fully explained than the 1st, so I recommend the extra money for this rather than the pdf download of the 1st.
Units are stylised - basically 3 stands of 6 figures for infantry (+ a base of pike for those so armed) and squadrons of 6 figures (2 stands) for cavalry. I particularly like that the cavalry is deployed by squadrons rather than anachronistic regiments, a fault I find with many other rule sets. Mind you, Barry's squadron represents 200 - 240 sabres, so in reality 2 French or other country's units with small squadrons, though only 1 of some larger German formations. Reference to OOB's is useful. Barry & the chaps on the League of Augsburg website are very helpful should you need help. Re-basing figures is generally not needed.
Orders, Formations and Movement are simple and it really captures the flavour of the period consistent with all my reading on the era (I've "devoured" most of the references in English print on this period). The fact that some units may not move if the brigadier is average or less is great, and there is an entertaining section of random events should players chose to use them. Artillery is not the "uber-weapon' of later periods. Command control is important.
These rules can be used at many levels - small one on one games, larger games, campaigns or scenario/teaser type games.
The rules are well produced, with some excellent eye candy. They cater well for stated period - 1688 - 1715. Thoroughly recommended.