Solid starts vs 101 before 1?

Hi! My little guy is about to start solids and as a FTM I am a little nervous! I have always been a by-the-book type person, so I think it will be less stressful if I have a plan to follow with instructions as I get the hang of it. I have budgeted out to get either the solid starts for a year or the 101 before 1 bundle, but I can’t get both. I am just looking for opinions on either or both as to what you think is the best value for the money! Thanks!