It’s hard to answer this question definitively since what type of controls players use depends on their personal playing style. While some prefer gaming using their keyboard and mouse, others may be more comfortable gaming with a controller while on their beds.
As for the competitive advantage, it depends on the character you’re playing. Naturally, playing someone like Hawkeye will likely be better with a keyboard and mouse since he requires accurate and quick aiming. On the other hand, Scarlet Witch only requires players to aim in the general direction of enemies, making it easier for controller players to level the playing field. It’s a good idea to try out both controls before deciding on the best one.