I use a mixture - in fact I don't use a clicker much as I often forget to carry it, but it is brilliant when I do use it
You do not have to stick to one method though - it is a question of what works best for you and your pup.
I think you can train your pup to understand voice/hand signals, whistle commands
and clicker in due course. I find voice/hand commands good when she is near me, whistle good for recall when we are out and about in the woods etc, and clicker for teaching specific behaviours eg sit, paw, roll over etc
The main thing with training if you ask me is, whatever methods you use, to be consistent
Happy to show you what I do when you bring Molly up to play - just an excuse to get you here so I can have a squish