OP looks like you already ordered but:
I got a S3 4-25 a few weeks ago and tried another one in person before buying it - and tried an S5 as well. I also spent about 45-60 minutes looking through a Tract 4.5-30 and a 4-25 over the weekend with a friend who got both recently. In short, I'd be happy with either one, but I prefer the S3 slightly. [[Edit: realistically, it would come down to price at the time of purchase - and I'm really not sure about the S3 being $500+ "gooder" than the Toric]]
Keeping in mind I'm probably biased because I had to spend my own money on the S3 vs I looked through both Tract scopes for free, but in short, I like the "scope" part of the S3 slightly more in most ways and like the reticle on the Tract 4-25 a little more. I also expected them roughly the same optic but they were more different than I expected. Specifics below but I'm not sure how much any of the below aside from the reticle is simply due to unit/unit variation vs different optics vs don't know because small sample size.
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Specifically:
S3 - I like the knobs on the S3 better, the "eye box" on both is slightly tight but just somehow it felt slightly better on the Zeiss at different magnifications and looking through the glass was easier on my eyes after 30 minutes - not sure why for either of these as they should both be using the same or similar Schott glass (Zeiss owns Schott IIRC) and have a similar mechanical design / parts from LOW. Etching of the reticle just seems to be "deeper" and the reticle just seems to have better contrast. The turrets are tall but not too tall like the Toric (especially when pulled up to adjust), elevation is not locking (obv personal preference) and windage is, and has slightly firmer / more distinct clicks, windage knob has perfect for me clicks / feel (again, personal preference). Clicks on windage knob for me was even better than the S5 or several other 10 or 12 mil/rev knobs on "better" scopes. The demo I tried in the store was not quite on the windage knob but had a slightly better feeling elevation knob. I also like how the S3 comes with the magnification adjustment lever that can screw into 3 different positions vs the Toric requires a separate slip-on lever that can only sit in one position.
Toric 4-25 - I like the reticle slightly better - I don't like how the subtensions on the horizontal axis change in size so much on the S3 but overall, I still like the reticle on the S3 - I just think the reticle on the Toric is more refined and better thought out. Also, it was a tiny / possibly placebo level difference, but I feel like the Toric showed colors a tiny bit more clearly and correctly than the S3 when compared side by side. The Toric has a much better feeling focus adjustment but has a narrower range of "in focus" vs the Zeiss - not sure why. I also like how the parallax is labeled on the Toric vs the vague rectangles on the S3. While I didn't test it and have 0 empirical evidence, the finish on the Toric seems like it'd be more robust. Toric includes a sunshade vs I have to buy it for the S3 and neither include flip up caps - both include "something" though.
One thing that irks me with both is how sensitive the parallax is - I feel like I have to readjust at 150 vs 160 vs 170yd or even slightly at 320 vs 330yd. This is not the case with many other optics for me.
With all of the above being said, I feel like the 4.5-30 Toric was a tiny to little bit better than the 4-25 Toric in almost every way beyond the typical improvements I would expect going to a slightly larger objective. Only way it wasn't better is it only parallaxes down to 25 instead of 15 and more elevation. The glass was a little easier on my eyes after a while (not sure why as I assume it should be the same glass and I don't experience this with other similar scopes only by going to a larger obj), the turrets clicked a little "gooder" than the 4-25 Toric for me, the magnification knob was just smoother (not that the 4-25 one isn't), there is a little bit bigger range of in focus and the adjustment is smoother than either the S3 or 4-25 Toric, the overall image quality just felt a bit better throughout the entire range, and there weren't slightly blurry edges at certain parts of the magnification range. In short, I wouldn't get the 4-25 over the 4.5-30 unless I either needed the lower parallax, smaller obj, the elevation or somehow just really needed to save $200 on a $1500+ purchase. I can't say I would get the 4.5-30 over the S3 though every time though. [[Edit: Regardless, both Toric scopes were good and I'd buy one in the future if needed.]]
