Hi,

If you are referring to the top institutes in both cities then there are  top medical institutes in both Jaipur and Udaipur.. Some of them are

SMS Medical College,Jaipur

NIMS, Jaipur

Geetanjali University, Udaipur

RNT, Udaipur

RUHS, Jaipur

Comparatively Jaipur is better. Since you haven't specified the colleges you wanted to compare an accurate opinion is not possible. However you can compare the colleges of your preferences using college comparing tool given below and can opt best for you

https://www.careers360.com/compare-colleges

All the best.