i think quick labours are generally better but it can be very intense and very painful very quickly, its not necessarily good for your body or your baby.
ds1 took three days, long, painful and tiring.
ds2 7hrs, that was ok actually, it built up gradually and i felt in control
ds3 3 hrs, ok, it got painful very quickly but again managable
ds4 less than an hour, i did have him in a pool, was induced but as it was so quick he ended up having to stay in and be observed due to breathing difficulties, i didnt have topush he basically shot out on his own (10lb 13oz) think his size helped him come out so quickly! anyway it meant his lungs hadnt cleared propelry and during the night they had to get paediatrician to chek on him, take bloods and help wiht his breathing as he was really struggling, that was stressful!
dd took 3 hrs, here was the most painful as she was back to back, but had she not been the midwife said she also would have been very quick. but it was still ok.
i love gas and air tho and found it fantastic for all my labours and despite needing syntocinon with dd, and being induced with all 5 they were what i would call 'good labours' straighforward, no complications and i managed ok with gas and air and i was fine and baby was fine afterwards, tho i was in shock after ds1.