May be some one tried the Suzuki's fog lamps and can comment on your post, but as far as I know the basic difference is price Rs. 3,000/- or 3,500/- (after market) v/s 19,000/- (Suzuki's), after markets (DLAA) are good as well, I think no such difference in terms of durability of bulb, if flashed Suzuki as well is not offering any warranty.
So its better to change (if required) atleast 6 x sets (after market) in the price of one set (Suzuki's).