I have the TH100. I absolutely love the clean channel, especially with an EHX Soul Food in front of it to fatten up my Strat and Tele.
I find it harder to agree with the dirty channel. Over time I've come to hate the shape knob more and more, so much so that I don't even use the dirty channel anymore. I'd much rather have the three band EQ of the OR100, but that amp costs twice of what the TH100.
Not using the drty channel on my amp does me no harm, since I have an unhealthy obsession with dirt pedals. :)
I tried the OR15 and a few different Terrors a couple of months ago, and I have to say the I much prefer the OR15 over pretty much any Terror, except the Jim Root Terror - that thing packs a punch like you wouldn't believe it. The OR15, though, has just the perfect British dirt tones that I like. Might have to get an OR15 in 2015. :)