I think that they are for different usage purpose.
55-250mm IS lens is a good combination with your kit lens.
28-105mm is a walkaround lens but it might be too tight for crop body as 28*1.6 is about 45mm.
Lets just say i have the 28 105. And i seldom use it. If you want i can sell it to you. But there's dust in the front lens, doesnt affect picture tho.
Taken with the 28 - 105 with raynox 250. Infact i only take it out to do macro shots.