DPS as in actual damage per second isn't too easy to calculate, it all depends against which class.
There are still 2 main damage differences for me, and it's burst-DPS vs Sustained-DPS
Spiders have some nice DPS, but removable DOT's without any real burst-damage isn't fully reliable, especially not in RvR situations.
Wargs have sustained reliable DPS, and i think it would win it for me in that type.
BA's have some epic burst damage, however their cooldown-reliant, hence why for me the Reaver wins overall.
Reavers have some nice dot's, of which only 1 is removable, impale hits like a truck, bypasses some mitigation and the additional up to +100% damage from it completely ignores mits.
Alongside dev strike, as well as some nice overall sustained DPS with other skills.
With impale having a 20s cooldown and dev-strike a 30s cooldown i'd say that for burst-dps the reaver wins, overall DPS as in versitility in types it also wins, i'd like to see a comparison with wargs though.....
Anyhow my 2c