Lettuce appreciation society

Following on from Eyren post on another thread. I thought lettuce should get a little slot of its own. 
There are so many different varieties, shapes, colours and some very interesting names. 
Do you have a favourite? Any varieties you have trouble growing? Any you don’t like? Do you think they have different flavours? (Also mentioned in a reply in the other thread   ). 

I really like lolla rossa, Tom Thumb, and Morton’s secret mix ( from real seeds ). I grow these every year. Along with lots of others. I’m not a fan of lobjoits green cos & little gem ( also a cos, I think ). I find them to bitter,  but I still grow them! I just like growing lettuce. 

I grew a red iceberg lettuce a few years ago, I liked that. Never found any seeds again unfortunately. Iceberg not the most flavourful but I do like the slight crunch to it.