Brewdog do loads of great beers, they have had offers on recently with free delivery which meant it was roughly £1 a can. They also do a cracking stout which you can get in Tesco, £3.50 a can but it’s 9%.
Another favourite is Split Shift or Late Shift from Fierce Beer.
I would defo know the difference between these fine beers and a Tennents, I’d rather pay a bit extra for something nice.