Me personally, during vaginal sex my orgasm with a smaller cock feels harder and more intense but brief. Mainly because it's a clitoral orgasm.
However, a big cock that's fully stretching me out will produce a longer more fully body, sometimes just as intense but not as sudden.
Lastly for me, I'm able to have multiple orgasms far easier in PIV sex with a big cock. After the first orgasm with a smaller cock, I'm done. Sensitivity gets too high and I can't orgasm for maybe 10-20 mins after.
However, a big cock that's fully stretching me out will produce a longer more fully body, sometimes just as intense but not as sudden.
Lastly for me, I'm able to have multiple orgasms far easier in PIV sex with a big cock. After the first orgasm with a smaller cock, I'm done. Sensitivity gets too high and I can't orgasm for maybe 10-20 mins after.