The 35X scope is great for certain shooting disciplines but varmint shooting isn't one of them. It would be great for looking at the moon's craters but when that sun is blazing around 100 degs those heat waves are gonna mess you up.
I have 6.5-20's on three of my rifles (.243, .25-06 & 6.5-284) and they give me the flexibility I need for hunting and target shooting. Low-light shooting; 6.5X - gathers more light as legal shooting comes and goes, 12X - matches my bino's when I decide to shoot an animal and 20X; all the magnification I need for long range hunting, LR target shooting and load development at 100yds. (My fourth rifle, a .300WinMag, wears a 6-18)
When doing load development it's important to me to be able to clearly see a 1/2 - 3/4" dot or circle at 100yds. I want to know exactly where my crosshairs are at when the sear breaks. My point of aim has to be the same every shot.
I've done load development for other guys with 3X9's on their deer rifles. To me that's like walking in grandma's back bedroom, in pitch dark, feeling for the light switch/chain in the middle of the room!
Bottom line: if you can't see it - you can't hit it.