It’s possible to reimagine characters and approaches without fundamentally changing things, which isn't necessarily a bad thing. The Reacher portrayed by Tom Cruise comes across as intelligent, resourceful, and careful; he uses his mind and understanding of people. He acts according to what he believes is right, generally trying to minimize harm. He’s comfortable being alone. In contrast, the Alan Ritchson version presents a physically imposing figure who frequently resorts to violence, leaving behind chaos and bodies. While he projects an image of solitude, ultimately he functions as someone wanting to be part of a group. It's comparable to comparing James Bond with the A-Team: both are entertaining and deal with similar themes, but have distinct feels and production styles. Another observation is that Cruise’s Reacher resembles a contemporary Yojimbo character. The Ritchson version seems designed as an invincible hero who overcomes obstacles to correct injustices. Ultimately, it boils down to personal preference. I found myself losing interest in the series around the second season. P.S. The first season largely adapts "Red Harvest" with a contemporary objective.

Source on TMDB