Yeah, VX5HD 3-15 offers best value for long range hunters.
VX6HD has electronic scope level.
VX6HD has ZL turret for windage. IMO it's useless, wind is constantly changing, dial for elevation and hold windage, remember to put the scope on max power. TMOA is nice, but windplex will do the trick.
To me, the only advantage VX6 has is the extra power. But I think 15 power is plenty for ordinary people like me. If you shoot 1000 m, you might need the extra power to read mirage.
I don't like alumina caps, I use neoprene scope coat on my VX5HD 3-15 for better protection.
These are my opinions, your shooting style might be different.
I see VX6HD as a full size luxury sedan, it's nice to have, but you pay for it. Also, it's a hunting scope, there is a small chance you will destroy the scope. I don't see many G wagons on off road trails. I don't think VX6HD is going to make someone a more successful hunter. If you have $2500 burning a hole in your pocket, go for the VX6HD, it's definitely a slightly better scope. Personally, I would get the VX5HD, use the rest of the money to fund my beer and steak addiction.