Digging up this thread because I wanted to know what other people thought on the topic. It's so subjective, though, it's hard to relate to others what you experience during orgasm.
I was kind of disappointed by my first ejaculating G-spot orgasm. It was more of a sad little puddle than the awesome, fire hose stuff that goes on in some porn. But it was a let-down in more than just a pissing (or non-pissing) contest sort of way. The orgasm just wasn't as strong as clitoral ones, or ones with clitoral + diffuse, indirect G-spot stimulation. It was cool, and liberating, and I'm glad I know my body can do something so fascinating.
But yeah, clitoral orgasms (especially ones where we switch from vaginal to oral sex a few times, with some pressure on the pubic mound with his palm) last forever, and I've passed out from a few. I cry, convulse, and generally terrify men. Not women; they seem ok with it. But I've had a tough time letting go with new partners because I act so bonkers during and after clitoral orgasms. The physical sensations are sort of just tight, tight clenching and spasms that go on for up to a couple minutes and can be extended even longer if the right amount of pressure and stimulation is used.
I guess I always thought G-spot orgasms are more intense. Then, after the first solo effort during which I noticed a puddle on the bed, well...I realized I'd been having them during penetrative sex. For years! I liked them, yeah, but it was a bit anti-climati. My G-gasms feel like pressure that builds and builds and is released, and I get this shuddering feeling throughout my body, then I'm either done--sandwich and sleep!--or I'm completely ready for more. Never in between.
My biggest orgasms are from anal. I need a bit of clit stimulation to get there, but the neighbours probably think I'm getting murdered every time.