not that I am a pro but these are the considerations that I have mulled over on my new hull. My biggest factors were weight and cost. Steelflex 2000 is going to cost me about 300 bucks (sandblasting and painting) where as poly would have cost me over 1000. After seeing my buddies brand new sled take a rock dent over a foot wide on its maiden voyage poly could quickly pay for itself in what it saves you in hull repair. Another buddy has a 12 foot sled with an O-540 and the poly bottom just makes that boat slide across the grass its mean :twisted: .
poly- better protection for your hull, slower in open water, much heavier and more expensive, labor intensive, get stuck less, lots of holes in your hull.
slick - much much much cheaper, even with sandblasting or prepping hull application and labor time is just a few hours, little to no protection from hard objects, virtually weightless, no screw/bolt holes, must be reapplied every so often.