My view is there isn't a good answer to petro1head's question. It pre-supposes there's a best buy make within a given price range, ideally cheap.
In my experience what separates inexpensive instruments from well-made ones is the latter are reliably smooth time after time. Cheaper movements tend to get sticky as they age, with the needle moving in jumps. Mild jumping doesn't matter much, but it gets annoying and slows work down. More than mild sticking is horrible.
Might be due to dirt – which upsets better dials too – but cheaper dials are probably less well finished inside and have inferior or fewer bearings. Work well new, but liable to wear out faster. Although cheap isn't good in a busy workshop, the same instrument could last forever In a home workshop.
It's not clear to me who actually makes DTIs. A quick look on the web reveals many unbranded dials, plus the following 'brands': Dapetz, DML, Katsu, WMBLK, AB Tools, Neolock, Dewin, AutoOutlet, Bergen, Neilsen, Laser, Toolzone, Mercer, JB Tools, Verdict, Satra, Grasmere, Baty, Dasqua, US Pro, and Draper. I didn't find Starrett, Oxford or Kennedy.
At least 6 of these brands are retailers who have had their name put on a generic instrument. I see 3 brands who made dials in the past, and might still do so, or possibly the firm went bust in 1975 and sold the brand to the Mafia. These days manufacturing can be almost anywhere, but if it's made in the West it will be high-end and cost more than £50. Can't trust the old boys either: the chap who recommends a make because his dial bought in 1955 is still going strong, could be horribly out-of-date. Plenty of firms who made good tools fifty years ago no longer exist, or their name is owned by someone else. Recent experience is much more trustworthy.
Price is a better guide. A dial sold for under £10 risks being too cheap. A dial sold for over £100 is probably good, though there's always a risk of paying over the odds for a fancy brand-name. 'Reassuringly expensive' is a type of scam.
My answer is to either accept I'm taking a risk, or – more usually – to buy from a UK supplier who will swap the item or refund in the event I get a dud. Easier to assure a supplier than the quality of a physical item before buying it. My aim isn't to buy the best possible tool for the lowest possible price, it's to de-risk what happens if the purchase goes wrong.
I have a Clarke lever dial too, also about 10 years old, and it's getting sticky! Maybe it's how long this inexpensive type can be expected to last in an ordinary workshop. I'd have been happy had it lasted 5 years, so it was a good buy. Certainly Far Eastern, I'd mark it 6 / 10 – did the job, satisfactory rather than impressive.
I had a good experience with a Dasqua digital caliper, and might try a Dasqua dial when the time comes. The caliper is priced mid-range, and it slides better than the cheaper variety. Not more accurate, just comfy and faster to line up. As Dasqua appear to be targetting the upper-end of the mid-range market, I'll probably give their dial ago. I have no idea who makes it or where.
Dave