I've tried both MP and SP versions. Here is the comparison.
MP:
I've bought leather made forge, bought workbench and chemistry made powder and pipe bombs. Made iron bars in forge. Bought some iron bars too.
Bought flagstone, made pole, made defence from it, upgraded to cobblestone. Nice. Made some fences in workbench. Helped a bit.
Bought 14 dynamite, yey!
The only thing i haven't got is mining helmet, but got night vision - ok too.
Result - first night survived. 6 pipe bombs left and some ammo for smg.
SP:
Leather - nope, flagstone - nope, workbench - nope, forge - nope, chemistry - nope, rebar frames - nope. Dynamite or other explosives - nope. Molotovs in general stock only lol.
The only useful for me that i found was mining helmet.
I bought 3 leather armor and scrapped to leather to make forge. Bought wet concrete blocks, built wall, upgraded when dry. Built another wall. Made plates from bricks and tried to use it instead of poles. Made iron bars in forge. Made powder myself, have made some pipe bombs before night.
Result - base dead. Not enough explosives and too bad defence. No pole - no life
So in MP with 4 vendors i bought everything i need to survive.
In SP - nothing was available from what i need. Bad luck? Sure, always
From what i saw, the only difference for MP is one more Stage of zombies. Like on first Night in SP it is Stage0 and in MP it was Stage1.
Total count pretty much the same.
In MP i've got couple puke and one fire puke. In SP i've got 2-3 puke and no fire puke. Difference is very small.
So if i choose what version to play, i would definitely choose MP. Even beacon is same size lol.
I just don't see any reason to choose SP version, even when playing solo.
By the way, how it will work with few players? Before it was beacon for each player and each beacon spawned 1 group of scouts each 4 minutes. So 4 players = 4 beacons = 4 spawns.
But now... 1 beacon, so zombies total count in MP and SP is the same? Regardless of players count? Or additonal player triggers additional scout spawn too?