Number two top, but next time when you where the second one. Where pants that don't look... I don't know what word to describe it... odd when worn with the top. I'm assuming you wore the same pants in both pictures. If so those pants look fine with the first top, but second top, could choose a different kind. This is just a suggestion of what I think would make the top, which is already appealing, even more appealing. The pants you got on now are fine with it, but since you were wondering which top looks better, just giving my opinion on how to enhance the top to look better. Who knows, I could be the only guy, or even person on here that thinks this so... take what I say with a grain of salt. :)
Not sure whether you're looking for a guy or a girl's opinion, but here goes. Number one seems more conservative while number two looks slightly more flirty. I think number two makes your jeans look better, and I also like how your midriff is showing slightly. Just enough to show that you're confident but not promiscuous. Also, I like the frills. Sorry, this post probably sounds more like what a girl would write.
Honestly, I really like girls' hair, so the first thing that my eye was attracted to was your hair. You have long hair which I really like, but I feel like it looks better in number two, so that might have swayed my opinion also.
#2. Number 1 is too busy with the lace, it takes all the attention away from yourself while at the same time streamlining your curves and making you look boyish and without hips.
Number 2 is simpler and IMO thus more elegant which acts more as a complement than a detractor. The bottom ends at a good level to show off your hips while the ruffle-ness at the top draw your attention that way but does not distract from yourself.