I don't have any experience with the Wolf Tooth tools, but there is nothing in the design that makes me think it wouldn't be reliable for cassette removal.

I will say that I have the Crombie and it is an absolute pleasure to use. It's my cassette tool of choice even in the garage. I have the matching chain whip, which is great and convenient for storing the two together though as you note you wouldn't need that for travel purposes.

The two biggest advantages I see of the Crombie over the Wolf Tooth tool are the one-piece design and the fact that the round surface will feel better in your hand than the flat edge of the Wolf Tooth tool. Whether that outweighs having a bottom bracket tool is your call, though for remote touring/emergency use I would think having an extra tool is a bigger plus than convenience and feel. On the other hand I think you're a lot more likely to want to use the Crombie at home.