I have an Antares, and I love it! The leather is the softest and also most durable I have found. I prefer a forward flap, it makes jumping more comfortable for you and the horse. It allows for the correct position and stirrup length. While Antares saddles are expensive even used, they are definitely worth the money. They last a long time!
I use an equipro jumping saddle! and yes. I prefer the more forward cut style compared to a GP. It makes it easier to sit out of the saddle when needed and places your leg in a better position for jumping