If you're racing solo around the cans, when you go around the windward mark or just after a gybe fussing around with a chicken line with your hands could cost you at least one boat length due to the kite not pulling. Multiply that by 4-5 windward mark roundings 12-15 gybes then that's in the region of 20 boat lengths wasted in one race. Therefore I think toe straps are probably better in this scenario