I know this is more than you're asking for since you have only asked about those 2 skis but there is a recent thread on here labeled "what skis for m series" that has a bit to say on the topic (below is what I threw in the thead but didnt want to write out again.
Any between the gen 1 and gen 2, I think wyoboy1000 is right on the money, the gen 2's are a lot of ski unless you are on a 4 stroke or deep powder. An alternative with them though is to cut the outside off them. This way you still get more float than the stock or gen 1 but you still get the handling/sidehilling capability and some added float (if float is what you're looking for) but with a light woman on an M8 there is already going to be better float with the stock or gen 1's over a guy riding the sled.
taken from other thread-
2 skis to comment on:
- SLP Tri Keel: absolutely got rid of any darting I had with stock skis on the trail, works great in the powder with great float as they have a bit more surfacce area. Do not like these in the spring snow conditions because the tri-keel just takes that much more steering effort in the packed/heavier snow that I think it could possibly contribute to steering linkage/assembly wear since I'm cranking on the bars so much harder.
- Simmons Flexi-Ski: got rid of a fair amount of darting over stock skis but not all I found. Decent float but are bit shorter than the SLP's so they have a bit less float. I also found that the tips are set a bit lower than stock and SLP so with a certain powder depth I found they always kicked up a bit more snow at me than the others. Even when carving they seem to kick a bit more at the ends. Not a big deal but just something I noticed. Spring conditions they are pretty good, harder to crank around than stock but not as hard as SLP's.
- Bonus ski Stock: Not happy at all with these on the trail due to the darting (hate uncontrolled direction changes, however I do it all the time with destructive results in the trees). Not too shabby in the pow and I dont really notice too drastic a difference between these and the SLP's. Other than the trail ride in I like stock for spring snow conditions. They take the least effort to turn in the spring snow.
Never really worried about the weight of them as they are relatively close but the SLP's are probably heaviest due to all the extra plastic in them and I only have the high tech finger dangle weigh scale to go by.
Overall in my opinion I find them rating 1st choice to 3rd choice as:
Trail: SLP Tri Keel - 1, Simmons - 2, Stock - 3
Powder: SLP Tri Keel - 1, Stock - 2, Simmons - 3 (but not by much)
Spring Snow: Stock - 1, Simmons - 2, SLP Tri Keel - 3
Weight (measured on the finger dangle weigh scale, recently calibrated): Stock - 1, Simmons - 2, SLP Tri Keel - 3
Overall I rate SLP Tri Keel 1st, Simmons 2nd, Stock 3rd and I use the SLP's as my primary ski and switch to stock for spring riding.
