I am feeling nostalgic for a time when I used to have tremendously enjoyable technical arguments with John in meetings, usually finishing with the chairman saying mildly "G and J, could you tell us what we just decided."
The reality of this is that both methods work, and both have their problems. Increasing power without changing pitch input will, in the vast majority of aeroplanes, reduce speed, also requiring forward movement on the stick to maintain airspeed. Simply using the stick will upset the flightpath, so you need to use throttle as well.
So in the full analysis, you generally need both.
I have learned and used both methods - and both work. But, in good visual conditions, I still prefer to emphasise attitude, and use stick as the first point of input to correct attitude. Does that make me right and John wrong? Not really - there is room for opinion here.
G