Which is better ipt60 or s45 torch

I am trying to find consumables for ipt 60 - they seem harder to find than the s45// But i hear the IPT60 is a more durable torch with longer duty cycle… How is the cutting of each - if I plan on cutting between 1-2mm mild steel.

I know you can find .6mm nozzles for s45 - but you cannot find this with the pt 60