I will go for a suite if I can. The extra room and amenities are worth it for me though it does depend on the price - there is a point at which I say 'Nah, not worth it' but then I do look longingly at them.  

 It also depends on the ship and whether Mr LtL is coming (or I am travelling with a friend). He loathes main dining rooms which are akin to a barn so we will book a cabin that includes smaller  dining room like Aqua cabins on Celebrity (if not a suite).  For something like Silversea which is all inclusive and less of the barn for a MDR, we are happy with a balcony.