Very much depends on your actual driving and driving habits, in conjunction with the fact that there IS a treadwear rating system for tires.. and as such.. they are NOT all created equal.
OEM tires generally, though there can be exceptions, have lower treadwear rating codes, even though they lack the performance improvements that often go with low treadwear rating codes. The reasons for this are practical in nature... lower cost so lower sticker price on the vehicle... coupled with the fact that tires can be a very passionate topic with owners.... so why put lots of OEM money in a tire brand that the owner may actually prefer to replace for their favorite brand.
After market tires... where to start.... there are so many on the market and they run the full gambit of treadwear ratings, performance ratings, etc. Generally though..... when you go to a big market tire store chain... price will be the clearest indicator of expected treadwear... because looking at a wide inventory within a single tire store chain you are getting as close to apples to apples as you can (setting aside any promotional sales pricing).
Michelin Defender series.... I have always found them to be excellent in treadwear, meeting or exceeding Michelin mileage figures.... even with heavy urban driving which is hard on tire treads due to constant accelerating from stop, braking to stop, turning.. particularly right turns.
Net net.. if you buy inexpensive tires, do not expect to get premium treadwear results.