There is a 118 year long debate on which of these rounds is better. I doubt it’s going away any time soon (especially here on MO). I thought I’d share a link to a caliber “battle” written by a non lever action biased source. Jordan has done in depth comparisons for a bunch of the Ford vs Chevy type caliber conundrums. I think it makes for a good read.
www.themeateater.com

.30-30 Win. vs. .35 Rem. - Caliber Battle
The .30-30 Winchester and .35 Remington won’t break any speed records—there’s no doubt about that. Still, much like the old man who can rattle your teeth with a punch, appearances can be deceiving. The elder statesman of the deer woods, the .30-30 Win. hit the market in 1895 paired with...