TwoSix
Everyone's literal second-favorite poster
For this specific case, it's pretty much choosing which flavor of nothing burger you want. Probably the single most impactful thing is the choice between Dex and Con saves, otherwise Fighter 1 is giving you heavy armor you're not going to use (because you're Dex based) and 2 extra hit points, and Rogue 1 is giving you your 7th most important skill proficiency.It's only one less skill, you get an additional one when you MC into Rogue. The shield proficiency, for example, is easily worth one less skill to a whole lot of builds.