I bought the 15x Forge as I could not afford the Swaros. Later, I had the fastest clean on the prs barricade at a local rimfire match and won the Diamondback HDs. Vortex is a great supporter of our sport, but my Diamondback HD will be used by my kids to spectate at centerfire matches. There is no comparison. You have to spend real money to get into the better vortex offerings.
I don't know if I just got a good pair or what, but my Forge hold there own. The ONLY binos I have been behind where I can see more are the swaros. It is pretty rare where I can see something with the swaros that I can't see with the forges.
There is definitely a difference, but if the swaros are a big stretch financially, the forges are pretty good. If it is not a big deal financially, I would spring for the swaros.