I love knives, pretty much period. That's a complete sentence. I like em with locks, without locks, I like 'em all. The only ones I don't really like are friction folders, because most of the ones I have seen (and owned), are essentially relying on a small tang that hits you right in the area between the base of your thumb and index finger in order to stay open, which makes them not great for heavy cutting chores. This is my direct experience with them.
Everything else though, I like. These days however, I DO prefer knives with locks, because they also tend to be one-hand-open/one-hand-close in operation, which ultimately I prefer. Now, that doesn't mean I don't have a nice slipjoint in my other pocket, but if I have a quick cutting job in my daily life (snipping a tag off a new shirt, or opening a bag of whatever), I'm reaching for the modern locking folder first. Quick out, cut, close, back in. None of my slipjoints do this.