Both the ThunderJet Alexis 2012 and the ThunderJet Northern Edition Envoy 2013 are modified-V designs, both built in aluminium, so the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
On paper these two are close siblings in the size department - ThunderJet Alexis 2012 at 21,0 ft versus ThunderJet Northern Edition Envoy 2013 at 19,0 ft. Weight tells a clearer story for trailering families: the ThunderJet Alexis 2012 tips the scales at 3 200 lbs - 800 lbs more than the ThunderJet Northern Edition Envoy 2013 at 2 400 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
Both boats share a closely matched power ceiling - 320 hp for the ThunderJet Alexis 2012 and 320 hp for the ThunderJet Northern Edition Envoy 2013. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Both carry nearly identical fuel loads - 50 gal and 48 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The ThunderJet Alexis 2012 is rated for 6 passengers, while the ThunderJet Northern Edition Envoy 2013 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the ThunderJet Alexis 2012 could be the deciding factor.
Bottom line: Choose the ThunderJet Alexis 2012 if your priority is putting more people on the water - it handles 6 passengers and at 21,0 ft it has the deck room to back that rating up comfortably. The ThunderJet Northern Edition Envoy 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.