I'm considering a Genesis io id as a do it al bike to replace my 29er Kona Unit. Beimg 5'10/5", I can ride either a 17.5" or a 19" with suitable stem adjustment. My stock Kona was a the 18" frame with a 100mm (I think) stem and a 59.7cm effective top tube.
The Genesis has ETT of 58.5 or 600, meaning stems of 110 or 90 mm respectively. What would be the effect of either choice? In general is it better to go for a shorter stem and longer ETT? Will the smaller wheels and shorter stem make handling much more lively? The Kona was my introduction to MTB's, and the current one has a lot lower spec than my old one. I'm wheel size agnostic (26er curious if you like), and fancy suspension for a change, and the possibility of conversion to a 69er if needed.
I looked at the archives and in previous sizing threads, both frames were recommended in separate threads