what is the different between these 2 schedule option?

hunthunt

click 1 project >> edit >> options >> schedule posting(all to post on same......)

star >> scheduler (all with status active) | scheduler(all selected)

s4nt0s

The scheduler in your project options tab is for scheduled posting on various platforms and handles things like how many accounts to sign up per site, how many posts per account, etc.

The other one is a scheduler for your campaigns so if you want to schedule 2 of your campaigns to run for x amount of time then pause and let another 2 campaigns run for x amount of time, you can do that. 

They're totally different features.