I use both depending on situation. There's no reason to avoid mapping a key combination function that already exist as a key. There's no strict reason to avoid

I use both depending on situation. There's no reason to avoid mapping a key combination function that already exist as a key. There's no strict reason to avoid adding key that can be done by key combination (but needs more vertical space, cost, and effort to build). I don't care vertical spaces much so I prefer to have dedicated function keys.