Hi jumping hope you are doing okay and glad that you are preparing for another go xx.
I've had one cycle on gonal f and one cycle on menopur. I've got high(ish) FSH and low AMH so my responses were always going to be poor.
On gonal f (450iu, long protocol,) I got 3 follicles and 3 mature eggs. However they were rubbish quality. On menopur (300iu, long protocol, down reg-ing on the pill and then 'microdoses' of down regs) I got 3 big follicles, 2 smaller ones (so there was a tiny bit more 'action'!) but still only 3 mature eggs. However, this time they were top quality.
So the menopur was probably better for me but in terms of response there was little difference. The key difference was quality and there seems to be mixed evidence about which drugs give better quality. Plus it's very possible that the differences in quality were nothing to do with the drugs - after all, with so few eggs each time it's difficult to get a good idea of my egg quality - or the responses might have been different due to protocols and the gentler down reg-ing of my menopur cycle.
Generally, I think menopur is given to those ladies who need a little bit extra help as it contains both LH and FSH - gonal f is just FSH. Dr Google suggests that the LH might damage egg quality and that it might not be a good idea if you have PCOS and elevated LH - but I've also read that menopur improves quality (and perhaps it did for me) so who knows!!
I think if you do a short 'flare' protocol then you are more likely to use Menopur but it's worth taking through with your consultant whether this is the best option for you. Our consultant persuaded us to have one more go at long as you have more control and I did respond to the stims the first time.
From a practical point of view if you've had gonal-f pens then mixing the menopur does feel like a real faff but you do get used to it by the end.
I would ask plenty of questions about different drugs and protocols and whether there is evidence they would offer improved responses for your situation etc.
Wishing you all the best with your next go x.