Get both.
I have an early-80s Mini-14, an Underwood M1 and a Rock-Ola M1.
The Mini-14 shoots a round with more FPE but bullet choice will really make the most impact when considering terminal effectiveness. .223/5.56MM ammo is generally cheaper than .30 Carbine.
.223/5.56MM has a flatter trajectory than .30 Carbine, but this only matters when trying to hit small targets at long range.
Without a flash hider, the Mini-14 has a visible fireball when fired during daylight. I added an Eagle HK-style flash hider/front sight to mine, which also greatly improved on the factory front sight.
With the demise of the AWB good Mini-14 magazines holding more than 10 rounds are now available. USGI 15 round Carbine mags can still be found but are starting to dry up (it only took 60 years). USGI 30s are hard to find.
Both are reliable and easy to maintain. You can get the Mini-14 in stainless steel if the rifle is going to be exposed to harsh conditions. The Mini-14 has a simpler gas system (stationary piston, no piston nut that should be stake in place). The Mini-14 may have an edge in reliability because the design vents more gas than normally needed to work from the barrel.
An M1 in a repro M1A1 folder will be shorter than a Mini-14, even if the latter is in a folder.
Mini-14 Ranch Rifles are designed for easy scope mounting. Mounting optics on regular Mini-14s or M1 Carbines isn't as easy. The best way to do so is in a scout configuration using an Ultimak or Amega Ranges mount (replacing the handguard).
Most M1 Carbines are already fitted with a bayonet lug.