Handset Power Amplifier or basestation power amplifier?

Hi, everybody, I will choose my research interset not long before, my group chief suggersts me the basestation PA, I don't know how to deicide it? Could you give me some advices? Which one is promising? I mean which one is more helpful for harvest and good job? please don't reply to me, such as both of OK, if you are best, and some key technology and breaking points. Thanks in advance.