"Different" is a terrible answer because it could mean equally as good or even better in some ways.
If you want to recover from this, rather than feel sorry for yourself for the rest of your life, you need to accept the truth. If the truth is 'different' - and that's probably the case for most WSes - you need to accept that.
If the sex with BS was better than AP and the WS is not totally clear about that they should be locked up for stupidity.
Can you clarify this? I don't understand what you mean here.
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You seem to be spending immense amounts of energy comparing yourself to the ap.
Here are some recommendations from me:
1) Stop comparing yourself to ap. As I think Bigger pointed out, your W cheated. Does it matter who she cheated with?
Besides, you can be only you. If your W chooses the ap over you, that's about her fucked up preferences; it's not about you - and you can't be the ap anyway, without fucking yourself up.
2) Stop thinking about D and R. You're not ready yet, because you're still in shock, getting thrown every which way by the trauma.
3) Get help dealing with the trauma. Get help dealing with the grief, anger, fear, and shame that comes with being betrayed. Get help releasing the pain (well, getting a start on releasing the pain).
4) Once you start healing, you can address the D/R choice.
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You say you'll D her if she had better sex with the ap.
That says to me that you're really insecure about your manhood and sexual skills. I mean that gently - my bet is that the men here think you have no reason to be insecure. I certainly don't. IOW, I think you keep attacking yourself for no good reason - a good IC can help you stop that, and I recommend seeking help.
You need to stop questioning yourself.
You are what you are, but skills can be developed. I doubt that you have to be more skilled than you already are, but...
I'm a cyclist. Developing new cycling skills can be difficult and painful. Developing new sex skills, OTOH, is probably pretty pleasurable. If new or enhanced skills will reduce your insecurity, my reco is to go for it.
[This message edited by sisoon at 1:03 PM, September 30th (Sunday)]