It's hard to say without knowing what you're paying.

Defenitely make sure they have wings lol.

if they have radio gear make sure you cycle and test the battery capacities or simply replace.

dont use old rubber bands for the wings if that's how they fix.

take fuel, glow plug etc and see if you can start the engines.

The 120 must be a good sized plane so make sure you have the experience to fly it and do so in a safe place. With you asking the initial question it may be that you lack the experience to setup and fly these planes. You may have plans for a trainer first but worth mentioning. These are decent sizes planes that won't be too forgiving on a poor landing.

all the best with your purchases though bud. Keep us posted.