Eventually both interviews came with an offer and the third was a raise from my current employer - the current employer was auto rejected too as they'd not been a good employer over the years and it annoys me when you suggest you are leaving and get offered more money whilst you've been rejected any pay rises 3 years in a row across the larger area we were in (but again, was open with them from soon after applying externally to give them the idea of what was happening), so moving to a new role even at the same pay was a good move for us.So was that a counter offer from your current employer (at the time) or one of the two new employers you interviewed at?
I was lucky and i'm not trying to boast, i think i was in the right place at the right time, but overall imo, honesty is best - you want to work with these people for years and maybe look to work with the others in the future, best to keep doors open. Or you could just be completely cut throat and selfish and i'll call you sir presidenté of the world in 50 years