I had 15/45 in Maroc as well, works fine until you follow Keith up some singletrack where only goats go

I'm running 14/45 now for green laning and short trips and really like it. Bike will finally powerslide in third lol.

I will be soon getting 525 chain and 16/47 for the long haul to Turkey where I will swap to 15/47 for trail work.

So to answer your question ... I don't know