6spd:
I presume you prefer the price of the first? Oh, I see - you have the prices reversed.
They are hardly comparable lenses - they really solve different problems entirely.
The 28-135mm is a walk around lens for a full frame camera. On a APS-C camera, it is a normal to telephoto lens. It is a very old design that was introduced in 1998. You can often get it cheaper on eBay because it is bundled as the kit lens for a number of APS-C cameras (40D, 50D, 7D), which it isn't really suited for, IMNVHO.
The 55-250mm is a kit lens companion intended as the first purchase after the camera +18-55 kit lens is purchased. It runs from mild telephoto to long telephoto. As a kit lens, it is very light, it is very inexpensive for its range, and made (mostly) of plastic, but its optical quality is pretty good.
Due to its age, the IS on the 28-135 isn't as effective (nominally 3 stops) as it is on the 55-250 (nominally 4 stops). In addition, the 28-135 is at f/5.6 at 85mm, where the 55-250 is there at 154mm, so it is slightly brighter as a telephoto lens.
Really, though, it depends on your general purpose. I'd say a 18-55/55-250 is a great combination setup. If you want a walk around lens, I personally prefer the 15-85, or even a superzoom lens.
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