Well both are almost eaqualy nice but Kefalonia is far more beautiful as an island....

Both are lovely but I'd say Skiathos has more to do and is a bit livelier.

We found Lassi very quiet, everyone went out at 6pm and came back at 9pm so we were the only ones sat in the tavernas.

Lots of couples with very young children, prams and pushchairs in Lassi so it would depend on their ages.

You couldn't go wrong with either of these islands in my eyes.

Skiathos has something for everyone, The winner is ...

No competition. Skiathos every time. Lassi not the best place on Kefalonia, Skala would be better on Kefalonia and it is a lovely island but Skiathos Town is such a wonderful cosmopolitan place with something for everyone. And the island is so small and truly amazing !! You can tell I love it.

Agree totally with the others - Skiathos is fab with wonderful beaches and lots to see and its so beautiful and green - my favourite of all the islands...
cheers
Jan