IMO Chub will take anything that plops on their heads - but wise up pretty quick... I have dropped a small piece of masonry (chip of a weir) and it accepted it before ejecting it. If slugs have been used before they can be wary, so it is well worth investigating the weird and wonderful - the stranger the better.
Things I have used to take chub on the drop or surface dapping include: bread, cheese paste, luncheon meat, paste, bollies, pellets, slugs, snails, lob worms, sweetcorn, blackberries, morio worms, black crickets, locust....
That list is not exhaustive, there is plenty of scope to add to it, I have always wanted to take a chub on a cherry, elderberry, live fish - perhaps this years targets!
No, I am not sponsored by Drennan - I have a love for their 'retro' rods - original super specialists, Big feeder rod, medium feeder rod... plus terminal tackle is very good quality. As for floats, I rarely use anything else - though I do love Andrew Field's floats which get an airing every now and then!
At the moment, I am sponsored by mother nature