Hey. I did paddle javelin 22' last sunday on a lake- dead flat. I also paddled sic RS 21,5 to compare. Each only about 10min after 12km race. The weight was ok and compared to sic - I did not noticed any big difference. Also stability was pretty much the same, maybe javelin bit more stable- maybe due to wider tail and lower standing position. But the feel was also pretty much the same.
A week before that, I paddled 2020 SB Sprint 20,75, Again, after the race for 10min. The big difference is weight as Sprint is noticably hevier than javelin and RS, at least to carry, after the race. But it was stable for its width - standing position is low, feels almost on water level and drain holes do their work pretty well.
As for strike, I believe it is the same design as 2019, just different colour. I think strike and sprint are more flat water dedicated than javelin and RS, but it all comes down to the paddler's skill&power and preferences (as always) - it looks Casper is handling javelin pretty well :-) .
So, for us, average paddlers, the weights of the javelin and strike are to close to eachother to notice difference while paddling and to decide, it comes more to design preference, I think.
Cheers
test in German: - 12,22kg
www.supshop24-7.com/sup24-7-sup-infos/sup-news-tests/naish-javelin-2020/some downwind video from the same guy: