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Quick question: as the title suggests, I'm wondering if putting he killchoppa or the power klaw is a more viable choice for a Warboss on the rampage.

To compare the Choppa over the Klaw:
Strikes at S10 always (usually ID everything that isn't a monstrous creature)
Guaranteed ap2
But unwieldy and strikes last.

Killchoppa:
Instant death (unreliable, but can 1 shot a Dthirster )
Rending (runreliable, but same as above)
Strikes at I4 (probably still striking last in a challenge)

As said, the klaw is reliable at killing just about anything, but is last to strike. The killchoppa is fast(er) and has the chance to kill anything, including monstrous creatures, in one hit.
Now, the obvious problems with the Killchoppas reliability is enough for anyone to question it's use. Plus the fact that it's a relic, and thus means no lucky stikk is a major deterrent.
I've used both klaw and killchoppa in games and just can't pin down my favorite or even completely decide which is objectively better.
What do you guys think? What's the better tool for a more competitive, all comers list?

Klaw. Guaranteed AP2, ID doesn't matter as much as most big guys have Eternal Warrior or can buy it (unless you fight a lot of Blood Thirsters), and I4 sucks, as you're still striking at the same time as Tac Marines.

Plus, you have to give up the Lukky Stikk. It's the best thing Orks have

Main Warboss warlord should have the lucky stick or is Ghazzy. Still if you have another warboss giving him a bike and the eadwhoppa choppa will help when facing an army with a bunch of monstrous creatures. But the lucky stick is more important get it first.

Killchoppa can be theoretically more useful in some situations. But the pk is always good. Lukky stikk + pk/bike or megaarmor is a winner combo.