Babolat elastocross v Gamma tournacrossI've mainly used elastocross, but tried tournacross when the local shop was out of elasto and the tourna seemed cheaper online. I am an all-court player, struggling with consistency, who hits with moderately heavy topspin and uses 17 gauge multifilament string. I'd say that elasto doubles my string life. I haven't used tourna long enough to know how well it works, long-term, but I can tell that it is also extending string life.The two brands seem to use different methods to prolong string life. Elasto locks your strings in place so they don't move and don't rub. Less rubbing = longer string life. Tourna lets the strings glide more easily with less friction. Less friction = longer string life.Because of how elastocross works, inserting them tightens your strings a lot. I only use these on the sweet spot of my racket - 7 strings across by 8 strings high, and I needed to drop my stringing pressure by several lbs. When I used tourna, my strings were too loose. I'm sure tourna adds some tightness to the strings - it simply must - but significantly less than elasto. BOTTOMLINE: if you want to try one without adjusting your stringing tightness, you're better off with tournaInstalling is easier with elasto. The pieces separate during insertion more easily. Tourna is more likely to bend upon insertion, although once you get the hang of it, it was not a big problem. After inserting a unit, it is common for an extra unit or two to be left on the racket. It's easy to remove with your fingers, but then theyre not usable. I was also unable to use the last two of each stream of tourna units, so there is more waste.Tourna eliminates friction by "hugging" the strings. This means that if you insert it unevenly, which is very easy to do, some of the plastic will extend above your strings. Looking at mine, I'd say 30% are uneven. What's more, with my thinner 17-gauge strings, the plastic extends beyond the string, even when done perfectly. I know that textured strings are said to increase spin, and maybe these have that effect, but I think it has to be better for the strings to touch the ball. Elasto does not have this problem, as they sit between and behind the strings.My conclusion: if you use std 16-gauge string and don't want to adjust your stringing tightness, give tourna a try. All others should get their racket strung looser and try elasto.