Hi, I'm using the Solos since 2014, first the "old" one and since a few years the Solo 2. I owned also the Mighty, actual I own the Mighty+, the Ghost MV1, the Firefly 2+, the DaVinci IQ2 and the Argo.
Believe me, the effect is the strongest with the Arizer Solo II
Why? Efficiency ~ 80%, Volcano, Plenty, Mighty around 50% - take a look in the manual of the Mighty Medic 50%.
And take a look here for the "old" Solo efficiency
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4718604/
The Solo2 is even better!
But for on the road? Actual I'm using the Argo, but I just ordered the Crafty 2+v2. Cause the taste of the Mighty is better than the taste of the Argo (not Solo) Cause of this I will give the Crafty a try.