Shoulder stocks are a huge, huge bonus if you won't/can't sbr.
Further, the AK pistol arm brace plus a CNCW 4 piece brake (tames flash and softens recoil -- and weights 7.5 oz) makes the M92 package longer than a folded stock VZ58 w/ 16" barrel. I also think the folding stock rifle VZ58 will weigh less w/ a loaded mag and a similarly configured m92 (sbred w/ brace/stock, 4 piece brake, etc), due in a large part the reduced mag weights.
Atlantic lists the M92 @ 5.7 lbs and 19". Add a ~3" muzzle device and you're at 22.5" easy.
W/ sb47 @ 21.75 oz, you'd be looking brace at ~8.45 lbs.
Add a muzzle device of any type and you're at 8.7 lbs.
*M92s also are missing a rear sling attachment point. So you're either adding a steel CNCW sling loop plate or looping it around your stock arm.
VZ2008s stock are just under 7lbs. Add a heavier muzzle device and some other crap and you're still pretty well below 8.5 lbs.
And that's before you account for mags...
VZ58 mags are IMO far superior to AK mags. You can run polymer AK mags (perhaps 20 rounders) to reduce weight, but they aren't as durable as steel -- and polymer 30 round AK mags weigh about the same if not more than the aluminum VZ58 mag...
If you want an SBR weapon for a role where compactness is key, I think the pap is pretty solid choice. Like for a truck/trunk gun... My take is that for carrying in back country, weight matters a lot. If you aren't needing to hunt large game, take a serious look at 5.56 -- like a utilitarian lightweight AR -- or even a 14.5" 300 blk with a fixed muzzle device to save the SBR stamp.
Weight conscious and 7.62x39 it's really hard to beat a bare bones VZ58.
Size, VZ58 will be ~26-28" stock folded depending on muzzle device vs M92 at ~22" w/ muzzle device and ~32" w/ SB47 brace and muzzle device. W/ that increased barrel length, you cut down considerably on barrel length and result in a less front heavy/better balanced weapon. Spec forces brakes at 4oz are the heaviest I'm aware of for the VZ58... You also gain velocity and also reduce muzzle blast/noise slightly too.
Main drawback of VZ58 is that getting your hands on reduced capacity mags (20 rounders are a very handy size in 7.62x39 and result in a faster pointing gun for me at least than 30s) can be a challenge... It is a little longer, but 4-5" isn't much, especially if you're going to be slinging the weapon most of the time anyways.
In regards to price, that's also a drawback for VZ58s if you're convinced you need an SBR as the only option is Czechpoint, and they're pricey, plus you need add in the cost of getting and installing a stock. M92 is definitely a more cost friendly starting point if you're curious about 7.62x39 in a shorter barrel (10.5") but aren't ready commit to full sbr. VZ58 pistols are 11.9" barrels. (FWIW, Jim Fuller of Rifle Dynamics recommends no 7.62x39 Aks w/ barrels of less than 10.5" for serious work and I believe he cuts most of his custom AK barrels back to the 14" length or so... I'd imagine it's on his website if you're curious about all the reasons why.)