36-44 weeks of pregnancy and a few weeks of recovery from birth vs. A lifetime of being a parent and everything that is involved? I wouldn't say that being pregnant and giving birth is more than being the parent.
You talk as though pregnancy is just some little thing you carry on your shoulder and forget about. When in fact, it's one of the biggest commitments a human can make and the most profound, emotionally demanding, physically transformative periods of change a human will experience. And it is a lucky pregnant woman that doesn't have to put her career on hold or give it up entirely, or just not have one to begin with. This is not a small demand. It is a massive one.
The woman was aware that pregnancy could happen. As was the man. Why is it perfectly ok for the woman's biggest fear have to be whether or not this sex will end with a $400 abortion, but the man's has to be whether this will end with child support, mandated health insurance, education tuition, etc.?
Again, this isn't a zero sum game. There is not always perfect symmetry in the biological logistics of the genders. Pregnancy disproportionately affects a woman more than the man.
Maybe when we invent a way for men to be pregnant, or go back in time and alter the course of mammalian evolution, or grow new humans entirely outside of the womb, then we can talk about men exercising choice over whether the human they have conceived is born or not.
As it stands now, there is no way in hell a man can fairly choose whether a woman has an abortion or not. It cannot be justified. You've got nothing to bargain with.