The first thing you'll likely consider when choosing between two brands is which produce the cheaper running shoes. While the price isn't everything, it is useful to know how two comparable sets of trainers stack up against each other.
Nike, for example, includes ZoomX foam for lightweight yet responsive protection, Zoom Air pods for enhanced energy returns, and curved, carbon fibre plates to produce a snappy, 'rocker' sensation with every stride.
Having said that, whether Nike or Under Armour shoes are more comfortable will depend on your own preference and the trainers, so we can't speak for everyone when we say Nike shoes are the more comfortable of the two.
There is no clear winner when it comes to choosing the best running shoe manufacturer since both Nike and Under Armour produce excellent running shoes, which is why they are two of the most prominent sportswear brands on the market.