I’m gonna say the block, but after seeing the new McKenzie target, I would look at it first. Yes, you may spend more money, but in the long run, if it lasts longer, you may be $ ahead! I used to go cheaper on my archery stuff, then I found out by going the easy road, I always bought more, or had to replace sooner, after spending the money on two Mathews bows in two years, I owe it to the pocket book not to use cheap equipment! JMHO!
I’ve had the Old style Block for over two years now, Great target, just don’t shoot BH into it, it tears them up. I bought a foam broad head target just for BH. ( at Gander). The new 4X4 Block looks like they’ve made the improvements needed.