Depends on your play style. You like battle arena and getting falsely banned for "stream sniping" ? < PUBG. Like seeing half of the people on trade server don't even trade ? < TF2. Like competitive but stuck on the lowest rank and always play Dust 2 ? < CSGO. Like to run and gun and quick scope some kids ? < COD. If I had to pick one of the 4 games, I would go with TF2.
Also try unturned out. It's actually n o t that bad.