which is more intrusive?

[Korts]

Cheek to cheek or lips to cheek?

Former is a normal greeting in many cultures latter is way more intimate than a casual hug.

Hugs of course can vary a lot though.

Lips to cheek.

Uhh I dunno where you're from exactly, but cheek to cheek is the industry standard around here, and most other European places I've been. The side of your lips might touch their cheek, but you're certainly not supposed to plant a sloppy smooch on there.

[Korts]

As for the question, I've been told not to hug before, but the hug was an alternative option for the kiss already. We fist bump now. So I guess the progression is kiss > hug > fist bump/high five/handshake > wave.