I changed the gearing to 15/48 before a long overland haul - and it just felt much more right compared to the original gearing. First gear was a little low, but else it was very good.
Rode two sets of chain and sprocket on that gearing - each around 30 k kms. Now I have changed to 15/47 and have been riding 2500 kms on it but doesnt feel as good as 15-48. More clutching in junctions and at low speed. But maybe it needs more time to get used to...

Anyhow - gearing depends on what kinda riding you do and of course what you personal feel is right....

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Suzuki AC 50 -78 owned from 83 to 84
Kawasaki Kh 100 Es 81 owned from 84 to 86
Honda Transalp Xlv 600 -97 owned from 01 to 05
Honda Nx 650 Dominator -98 owned from 07 to 10
Triumph Tiger 955 i -01 owned from 10 to 13
Yamaha XT660Z Tenere ABS -11 owned from 2013 and present bike.
Honda Crf250L -12 my bike in Thailand.