Squat or deadlift. Easy. If I had to pick one, probably squats. I squat at least three times a week, sometimes four times a week. Deadlift twice a week.
If we were talking about muscle groups, favorite would be back. I don't necessarily like the movements more, but all these chicks seem to love a big, thick back. Although I do love my weighted pullups. I'm working to get it back to what it was before chemo, a biceps rupture last January, & a now twice broken left foot. Actually squatted & deadlifted last night for the first time in weeks; & felt it all through my back afterwards. Plus, a big, strong back helps the big three a ton, so I'm sure that plays into my love of back as well.
I hate benching for some reason. Just hate it. Probably because I'm not very good at it. Or at least I think I'm not very good at it. I think my numbers are fairly decent. Not awesome or anything, but respectable.