I see. Are there any difference in functionalities? Like some have more info, some have less

I've tried Jupiter and iTrade CIMB.

What I know is my current trust account gives bloody good 2.7% interest pa!  Downside is I'm stuck with 0.7% brokerage fee (or minimum RM30 incl. stamp duty and clearing)

In terms or research reports, I think klse.i3investor.com has a good listing of analyst summaries and TPs. On the other hand, CIMB itself gives you TA reports, quarterly reports, annual forecast for the next year etc. so depends on what you're looking for.

Also, I recently am logging into the new 'TC Lite' version of iTrade from my Galaxy Note 8.0 and there's a prompt asking you which platform you're using (iOS phone, iOS tablet, Android smartphone, Android Tablet) so either they're a) customizing the experience to one's device or b) collecting data.
Can't know for sure as I haven't tried logging in with other devices, maybe other forumers can comment.

Haven't used Jupiter in a long time so can't comment much except that the feel just didn't seem as sleek as iTrade imo.