I wrote my first book in first person present tense because I wanted the wonder and discovery in real time vibe, and that works best for my MC. Sentence structure and keeping the flow was a little challenging but I got used to it fairly quickly.
My latest book is in third past and it took a little minute to get used to writing in past. And there was a time when I was writing both at the same time so tense slips were common. I found that I would go from past to present more than present to past. Past works better for the story I’m writing and third fits my MC because I can still be free with how I write and add his thoughts.
Honestly it depends on your character and how their voice best comes across. Each have their challenges, but do what works for you.