I have only ever owned one Sig product... it was the original run 213 in Carbon... still sits in my desk holding one of my Squonk RDAs peacefully... Still works for the intended purpose I bought it for...( was matched with my Black Goon 24 as a beater mod)
I've owned 3 DNA devices one of which was the Therion 166...and it died... along with the other 2 DNA devices, VT133 and VT75...The VT133 is now just a glorified coil building tool... but it died in the first month...sent it back, works fine now...but I only use it to pulse coils...the VT75 USB port was bad, and the day I got it and plugged it in for escribe, it died...thats right, didnt even get to use it...sent it back lol
Why I say I'd get the sig? this isn't purely based off my experiences with the 2, but for the intended purpose of the 2.
I don't TC...and I know the DNA chip does VW really well...but regardless of me setting it to 75w or 60w, what it says still doesn't really matter, I'd still adjust it to where I like to vape.
As for which seems better quality in hand feel...based upon my personal experience... the Sig213 had a better quality feel than my Therion 166, even looked better imo... buttons never got mushy...always fired when I hit the button and has never failed.
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It held larger diameter atty's being 31mm in width ( For those that cared about over hang and or used larger attys, not really important for squonking)
But yeah if someone gave me $120 and said, you can pick the Therion 75C or the Sig Bf mod... I'd pick the Sig BF...For I know its intended purpose would be solely VW...and to me if it has the hand feel the Sig213 did, then I know for sure I made the right choice.
Plus another $60 to use on other stuff makes it such an easier choice.
But that is just me