AIB pays some costs up front while Pepper charges an arrangement fee of of 0.5% up to a maximum of €1,800.
I have some mistrust of Pepper, but I am not sure why. They reduced the rates by 0.45% - but they could simply increase them by that amount tomorrow. Of course, AIB could do the same and, if Frank gets going, they could do the same.
I am wary of any lender which does not publicly advertise its lending rates and charges. It's very hard to make a comparison.
AIB is embedded in the Irish market. They will presumably try to stay competitive. Pepper, or Frank for that matter, might not care that much about it.
In particular, I would be wary of taking out one of Pepper's sub-prime loans. But I suppose that those borrowers won't have any other option in the present market.