A The Cure song you like better live than studio

That's actually quite a hard question to answer, as live arrangements (along with personnel changes) have evolved quite a bit.
I would have to say that all of the Bloodflowers album is better in concert. The studio versions seem slightly "missing something" (although I still maintain this is some of Roger's best keyboard work).

Since 2012, Doing the Unstuck has exploded with unbridled joy & with Reeves tearing up that guitar break it just leaves me breathless.

Want is another. The one redeeming factor on WMS (apart from the run-out grooves) is a powerhouse in concert.

There are more, but only from certain eras.
A Forest comes to mind, but only 1984-96 versions with the bonkers guitar solos. These days I still enjoy it, but I miss the extended endings & improvised licks a lot.

& another shout out to the axe man supreme, Reeves Gabrels, FTEOTDGS & Wrong Number.
He knocks both of those clean out of the park every time.

Robert's always been quite vocal about how much he didn't like the way those tracks were produced.
Parry sort of took over even to the extent of the artwork used at the time.

Wrong Number. I used to skip this on the ipod, but Reeves has breathed new life into it live.

Wendy time, Cut(Away) and Letter to Elise from T&C2 !

I totally agree. Wrong number is really great when played live.

Killing an Arab/Another

I don't really care for the recorded version, like not at all. But live it's quite enjoyable! Just like Wendy Time, the "Play Out" version is actually amazing - wheras the album version is extremely skippable.

Big YES on "Play for Today" when the audience sings along to the keyboard part. That is INTENSE! And quite frankly, I can't listen as intently to the studio version anymore. The live cuts with the crowd singing blow it out of the water.