good eye man. haha. Hmm, for me I think I like the GT1 Plus more, *insert usual disclaimer for how everyone's taste differs*.
For the TEVI (on stock firmware), I found it a bit a bass light. Mids were just okay, but the focus seems to be mostly in the upper mids and treble. I found the treble on the TEVI to be pretty intense at louder volume, which I normally do when I'm jogging with them. It's definitely good sounding still, but for some of the music i listen to like j-pop with high female vocals, those can be a bit intense on the TEVI.
For the GT1 Plus, everything sounds a little more balanced in terms of how I perceive the bass, mids, treble. There's enough bass, but not too overwhelming or bloated. The mids are just nice for me, and both male and female vocals sounds equally good. Treble is a bit less extended than the TEVI and less peaky too i think, but still enough to have a bit of sparkle for my taste. Details retrieval probably better on the TEVI, but the GT1 Plus is pretty decent too and overall smoother sounding and a bit more musical?
With the TEVI without any EQ, it was really nice on some tracks provided the volume isn't too loud (i might be a bit treble sensitive). Some tracks suffers because there wasn't quite enough kick to the bass. On the GT1 Plus, most of the tracks sounds nice to me right out of the box. I feel like it's probably a tuning that is less offensive to a wider target audience, whereas TEVI might be an acquired taste for some. For the TEVI it's a little bit fatiguing for me for long sessions, but the GT1 Plus I've been listening to them while working since I got them and it's not fatiguing at all to listen to.
A few other things to note would be that the volume seems a bit softer on the GT1 Plus since I have to push it up a click or 2 on my Pixel 4 to match the TEVI, but volume is still sufficient for me.
Then are the usability aspects. While the TEVI has USB-C which is nice, the GT1 Plus is way smaller and easier to carry around. The earbuds fits me nicer too especially while jogging. The TEVI might loosen and wiggle around a tiny bit, but the GT1 Plus should be a lot better (I've used the GT1 before and this is pretty much the same design). My main use of TWS earbuds are during jogging, and sometimes when i'm out and about. So overall, I like the GT1 Plus a little better. Also, I prefer the Galaxy Buds over the TEVI as well.
Edit: Oh, and of course the much much MUCH lower price tag is a huge draw for me too. Since I'll be using them mostly while jogging, I can abuse them. haha.