in my opinion and as far as ive seen, engenier is only usable for rvr
and conquering castles etc.. wich i think is a great part of the game.
Wichhunter
is like a "caster killer" he will get the healers in the battle but he
will die wit them. However he is a high dmg dps, that can combine mele
attaks, this char is really useful in both pvp and pve and also
byurself ofc. And finally the white lion, of whom i cant speak so much
about xD but as far as ive seen is really powerful by himself, as well
as it can do great dmg in pvp.
I hope this helps u to choose, if those were my options, id try the ranger dps engenier, wich will be amazing in rvr

again thats just an opinion!