Wave+ is a best seller for a good reason, it doesn’t fit everyone’s needs, but enough people and scenarios that it does easily 80% of everything 80% good enough or better.
I'd start with that model and it's features and think about what you are likely to need to do, or want. Is outside opening blades, saw and file not important? Maybe a Rebar would be better.
I got my Rebar for $45 shipped brand new in the package from a seller on that big auction site. Half the price of a Wave. (I also have an OG wave and two new wave models!).
Do you need a bigger, more HD tool but the Wave tools are otherwise fine? Go to the Charge or Surge.
Not sure you can go wrong with any of the mid duty or higher tools, wave, rebar, super tool 300, surge, charge... With the bigger ones, they may be too large and heavy to carry other than in a sheath or pouch. That's going to be up to you.