I have a Solaris and a HF, both are good. HT probably better in all this filth although the Solaris doesn't have the best mud clearance in the world. The HF does have reasonably long chain stays so not quite as nimble on the smooth stuff but then when it gets bumpy it's of course much better. I run a 35mm stem on mine, both frames are quite long in the top tube as it happens
If you have been barely riding due to the weather then perhaps leave it a while and get out more on the 29HT you already own although those cheap HF bargains will probably go soon. See how you get on riding a HT more often then decide if you want full suss again as things dry up (LOL dry up? sigh)
Oh and I also had a Spearfish originally, that would probably be the best of both worlds for you, but, I sold mine as I couldn't get on with the short front centre especially when combined with size 13 feet and using flat pedals, the odd toe tap incident and it just felt too tucked under on the slow steep twisty bits.
Nothing wrong with "cheap" unfasionable bikes either. I have a Boardman road bike as it happens, couldn't care less what other people think, it was a bargain and does what I need. I've had Santa Cruz's, 2 Lapieres etc but a cheap Scandal 29er was one of my best bikes as it just fitted so well, that's the most important thing, no point having a mega expensive bike if it only looks good in the car park but doesn't ride how you want.