If it's not a virtual strobe, or a real strobe, it's not as accurate as it could be. Whether that makes a difference is where the issue is. I've done set-up work since 1977. I started in a guitar store with a real Conn Strobo-Tuner. After I left retail music I got by OK for the most part with various tuners using quartz timer systems (what they all use- despite the advertising hype most tuners wind up being about the same). It got to the point where I used a Sabine and a Boss TU-2 in series to average out the discrepancies. But I bought a Peterson VS-II as soon as I could and used one electric guitar that had never sounded right no matter what I did as the test. It took me about five minutes to get the G string on that guitar set so it sounded in tune all they way up and down, and in conjunction with all the other strings. I was sold.
Here's the deal. The standard tuners aren't as accurate. They're fine for getting into tune on stage with everyone else. But if you're doing set-up and the tuner is only accurate to ± 3 cents (the published specs on the Boss TU-2), then when you set up the bridge, you could be off by as much as 6 cents. When you play the open string and it reads as in tune even though it's 3 cents flat, then when you play the fretted note and it reads as in tune except it's now 3 cents sharp, you've got a 6 cent error. That's going to be noticeable when you start playing with others.
Now compare that to the Peterson virtual strobe technology. It's got an accuracy of 0.1 cent- a tenth of a cent. Now if you're setting up and get in-tune readings at either extreme, instead of being off by 6 whole cents, you're only off by 0.2 cents. That's why strobe tuners are better for set-up work.
BTW, a cent is 1/100 of a half-step.
John