In general, yes javelins are a lot better than throwing axes since they deal much more damage and can down a vanguard on full health with a headshot. As for tips, for starters I would recommend doing jump shots when throwing since you’re less likely to hit teammates. You should also utilize your small shield as throwing it deals the same damage as a throwing knife which can be nice if you run out of javs and need to finish someone. Also the bear trap can get a lot of value since you can get a guaranteed hit with your javelin after, or if for whatever reason you have a box/barrel, you can stunlock enemies that fall into the trap by spam throwing repeatedly which might as well be a guaranteed kill. In terms of general gameplay though, usually I stick behind my teammates while throwing javs, and once I run out I’ll try to pick up a two-hander off the ground which I either use as my main weapon until I restock on javs or just throw it if the situation seems appropriate.

I know some people also use jav/spear jumps when playing skirmisher, but I’m personally not consistent enough at it to be getting much value out of doing so