I think that depends on who you ask. I know my wife would say my CinnaMead- almost sickly sweet, but mix it with soda water and a wedge of lemon and you've got a delicious cocktail. That was my first mead to have ever made, so I had no idea about how much honey to add and what type of sweetness it would create.
For me, I'd have to say it was my Tikki Tikki Tembo CHERRYberry/BLUEberry. I made a large 18-liter batch then divided the batches into two. Flavoring one with Cherries and the other with Blueberries. It was strong, fruity, and dry. Great muddled with fruit and ginger ale.
In terms of novelty, I'd have to say HoppyMead- using hops to flavor the mead made it taste like a beer.