I would say I use 'Incredibly Friendly', 'Steel Bladder', 'Speed Cleaner', 'Stoves and Grills Master' and 'Gym Rat' most frequently.
Edit:
I realized I forgot to explain why. :smile:
So, 'Incredibly Friendly' helps with the popularity aspiration and it just makes socializing in the game easier. 'Steel Bladder' because going to the bathroom is no fun and my Sims spend a lot of time at bars, drinking. 'Speed Cleaner' does exactly what it says and I find cleaning even less fun than going to the bathroom. With 'Stoves and Grills Master' my Sims can occasionaly cook Impeccable meals and I use cooking, gourmet cooking and baking a lot in my game. And with the 'Gym Rat' trait building the fitness and wellness skill are much easier to build because Sims don't get filthy from working out.
I don't like to use the skills that make Sims sleep, eat or shower less (or not at all) because it makes the game a bit boring to me if I don't have to keep up with their needs.
