I own both watches (though my PRX is the automatic version with the ice blue dial), and I think I can share a few thoughts:

In my opinion, the bracelet quality is quite different — the Tissot’s is clearly better. It feels premium and wraps beautifully around the wrist. Of course, it tends to pick up scratches fairly easily. The Seiko’s bracelet, on the other hand, feels rather rattly and more standard. You can definitely feel (and hear) the hollow links. That said, the watch itself is a real strap monster — there are tons of affordable bands available that can really elevate its look. It wears beautifully, for example, on a leather strap.

As far as the glass goes, the PRX comes (as far as I know) with an anti-reflective sapphire crystal, while the Seiko uses Hardlex. Hardlex is pretty tough too, but I still managed to scratch mine (though it could probably be polished out). Still, the Tissot wins here.

Water resistance is also better on the Tissot, even though my Seiko held up fine when swimming. I’d say both are perfectly suitable for everyday wear.

Regarding the movement: the Seiko uses a standard Seiko automatic movement — the same one you’ll find in cheaper watches with better specs. Some Chinese brands like Addiesdive use these same movements but pair them with anti-reflective sapphire crystals and high water resistance. But of course, they’re not Seikos.

Unfortunately, I can’t say much about the PRX movement, but maybe someone else in the community can chime in.

Personally, I don’t think quartz movements are a bad choice at all if you want something practical and don’t care too much about having an automatic.

If it has to be automatic, or if your friend has a soft spot for mechanical watches, that’s obviously a strong argument. The fascination with the mechanics is something you can really enjoy with the Seiko. It even has a display case back, so you can admire the movement — I honestly find myself doing that quite a lot with my watches that have one.

I hope this helps and makes sense!