When I was looking at the Orange 4 Stroke, I had a few people on here recommend the Terror Bass. Like you I was not a fan of the form factor, but I ended up getting both and they were right, the Terror Bass is pretty awesome.
The lunch box design in pictures kind of looked like a toy to me, but once I got it in my hands I actually started to like it a lot. Very sturdy with just the right amount of weight to it. And it also seems that all of the Orange amps have this weight and thickness to the notes that many other amps lack. The D and G strings will not get lost in a mix with these amps.
I never played an OB1 since it really didn't attract my attention as much as the 4 Stroke and Terror Bass. But I can picture the heft in the notes that you are talking about. It is definitely present in the 2 that I have.
I also have a Mesa TT800 and that is a totally different type of animal, so I would imagine the WD800 is as well. More of a bloomy 3 dimensional sound with a beautiful top end. The Damping Factor on the WD will let you switch it up and find which one you like better.
Some will gravitate more to the Mesa while others will to the Orange. Me, I like them both for what they are able to give me. I'll be looking out to see what your thoughts are on both amps after you a/b them.
The WD-800 is still on track to be delivered tomorrow, so I've cleared my day to do a good comparison session. The Orange tone isn't one I thought I'd EQ for myself, but the tightness and heft of the notes transform it into something else. Being able to pick out every single note is quite the joy. I usually go for more of a rich low mid grindy tone with definition.Not surprised about the Orange. My first experience I remember was sitting in a decent size bar watching a Kiss band (for some reason) and the Gene Simmons guy was playing through a big Orange rig. His notes were hitting me in the chest and I was a good 50-60 feet back. He was a really good player though so that plays into it. That being said you could likely replicate it pretty close with the WD-800 because of it's extensive EQ section. Just gotta twist them knobs and find it.
If I can EQ the same note heft on the WD-800, then that will likely be the winner. If/when I try another Orange, it will probably be the Little Bass Thing. I'll admit, I've been spoiled by class D amps and at least size can be an excuse for it not having a lot of features, ha!
Having 2 ohm capabilities in your back pocket is quite a freedom, though...