i think that bottle rocket frames are probably tougher and heavier, at least that's the impression I got when I had a spin on one. ( And I own an older style heckler)
Bottlerocket for dh'ee / FR stuff I guess but probably suitable for more if you don't mind a bit of weight.
Heckler for do it all depending on build but not big stuff. Mines more than capable for me though.
Run a 50mm stem on mine with pikes and 2.3 High rollers mostly. ( older heckler design)