They're both very different sensations. Vaginal is easiest and I agree with RB, missionary is the best. With the right angle it's a 10/10 orgasm. Plus you get to see your partner's face and reactions which is always enjoyable.
Anal takes work and time, but once he's actually in it does feel good, the orgasm is different but with toys for additional stimulation it's a 7/10 and a much different intensity.