Quick question: Should I buy the BPRD omnibus HCs or TPBs?

I was going to order a bunch of stuff off of instocktrades tonight, and one of the things I want to start reading is BPRD. I'm going to get the Plague of Frogs omnibuses, but should I get the TPBs or the HCs?

I'm collecting Hellboy through TPBs and not the library editions, so I want everything to look nice together on the shelf, but I'm worried about the binding. Is it worth the extra $10 (and slightly inconsistent-looking shelf) for the HC?