You've probably guessed by now there is no wrong or right answer! Whatever you get you will make it work for your family. There will be 3 years and 3 months between my 2 these are the pros and cons I am projecting:
Pros:
1) DS is pretty independent now, he is potty trained, sleeping through, can play by himself, will even tidy up his toys. We're not teething anymore, and he's old enough to explain things to him if I can't do something this minute *coughs I can bribe him
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2) he gets his 15 free hours of nursery as of January, so we have been able to afford keeping him in nursery 2 days a week while I am on maternity, nice break for me but he loves nursery too, and it means I won't ever be paying for 2 kids to be in childcare full time at once.
3) I'm hoping it's still an age gap close enough for them to be playmates, this can never be guaranteed of course but my brother and I had 3 years between us and it was a good age to grow together, there was enough "common ground" that we shared a lovely childhood.
Cons
1) especially because we are expecting another boy a part of me wishes there was only 2 years between them just so they could be closer as friends, I know there is no guarantee over how a relationship will turn out but I do think perhaps they would have a little more in common.
2) we are very much out of the baby stage right now, DS lets us sleep in till 9 or he'll climb into bed with us in the morning and watch a little tv and let us snooze. He doesn't demand every minute of our attention and I am loving not changing nappies lol, it is going to be a bit of a wake up call being back in the baby zone, I imagine a closer age ago is like ripping a plaster off, more painful but quicker lol (I'm not overly fond on the baby stage 2+ is much more fun!)
On the hole though for me the benefits of a slightly larger gap outweigh a smaller gap, it has enabled me to stay employed, spend time with DS1 and for me personally I just see it being a bit more manageable. But this is what I am hoping works for my family, I don't think there is a wrong age gap although I wouldn't want larger than 5 years but that's just me.