being an avid collector of SIGS ( even have a 224 elite, likely the most disappointing sig I've touched)
comparing the x series triggers to the SRT isn't even close to the park ( a trigger in a 2k + target pistol vs an EDC SRT trigger in a pistol half the cost is really unrealistic you'd find the same results.
on SAO or DA/SA
with the SRT, the difference in trigger pull is so slight its meaningless unless you have difficulty in pulling 5 lbs with a finger..( I'm pretty sure none of us are grandmothers in our 80s)
so the real question is do you want to carry cocked and loaded or loaded and uncocked.
personally i opt for DA/SA because the chances of a 2-3lb mistake are concerning more than a 5 LB mistake.
the pull is of little consequence.
with the standard trigger the difference is more pronounced in the much longer trigger pull and more grainy feel of initial shot from double action.
on legions, I own a 226 in 9mm da/sa legion. because I shot a 229 and 226 SAO in 9mm and could feel the difference from the cocked, short pull and the double action enough to have it matter holstered to me. ( the SAO pull on a cocked SIG is light enough to make me consider the potential of tripping it setting my fat ass down)
the added features with the dovetail, finish, cool factor, et al on legions are attractive. but as an EDC its not on my list. because IF i ever have to use it i don't want it confiscated for an undetermined amount of time I don't want a full size bulky pistol on my hip and there care better options ( 938 for example)
since i also have a 226 tacops and compare it with the legion often, i think there is little difference of note between them. the thing the tacops has over the legion is the threaded barrel, which if you don't own a can means nothing. I think some tacops also come without the set, not sure, but with it, nothing of performance I can see.
the legion is of course finished better, but not by much, its more unique but it also doesn't come with full on stacked for hell mags like the tacops.
so to me. between them it comes down to this.
legion= more collectable
more finite finished detail
cool box
tacops= threaded barrel
in the box bigger mags
customizable with additional stuff ( which to me, if your exchanging grips on a legion or otherwise changing the look, you kinda missed the point.)
other than those two. the only other sig id say tops it are the X series.
german vs NH sigs.
i got an old 226 and an old 220 made in germany. the frames will certainly last longer, but they don't leave the safe. ( neither have rails) so the longevity of them is a moot point since I'm not pushing them to see what happens in 100k rounds.
I do have a basic 226 thats up to about 60k rounds and while its got signs of wear, it still is in good condition, shoots fine, and is often the goto gun for teaching new people to shoot. ( my wife loves it and shoots it weekly, typically pushing 500-1k through it each time, I've considered not bringing it just so she practices with her EDC. but my couch is lumpy.)
edited to add.
226 vs 229. to me, a double stack 9mm is just that. its still a bulky full size.
my 229 is another safe queen because i feel i shoot better with the 226. not that i think the extra barrel length really effects accuracy, but that the little bit more weight on the top mitigates recoil a bit more and allows faster follow up shots.ive also only got two SAO sigs now. mostly because i just don't like a cocked hammer without a thumb safety.