Guys, wondering which is the best choice ? apply for OPT EAD or use EAD through TPS for F1 student?

BOTH ....It will hurt you in terms of money, however get both the EAD. When you do start working used OPT EAD though because of tax reasons.

Get both EADs but use OPT EAD. Are you going to be on STEM OPT or regular? If STEM, more the reason to use it as TPS EAD may or may not be extended beyond 2018.

Benefit of getting the TPS EAD even if you don't use it now, is that you can instantaneously change employers without any additional USCIS paperwork in case such a situation arises that you need to quit your first job.