Makita is my main 18v line of high quality tools and IMO can’t be beat because of the variety they offer. If a person is thinking of adding on over time, I think it’s the best of the top brands. Of course, Milwaukee, Dewalt, etc. have their advocates. But I tend to mix and match, which most people don’t do. They’re right, it adds to the clutter and confusion of having to charge different brands.
But I have three different places I work regularly, one in the country, where there’s more outdoor work, so I have these things spread around for best uses. Making trips back and forth for tools wastes time and gas, also could take much of the day, so a $79 brushless saw that cuts 7 1/4" makes economic sense. My Makitas live in my main shop with a few other specialized 18v tools and don’t go outside or to the other two places. Ryobi, the Kobalt saw, and 12v Bosch drills do. I’m a DIYer and woodworker, but if I had my tools in a van for a business, I’d likely pick one battery platform and stay with that.
Also, I’ve accumulated things based on ergonomics/price/sales, including battery cost, battery cost is why I like Kobalt and Ryobi.
It sounds like you have given careful thought to how you’ll use the tools and your interests, like gardening/biking. So for you, size/weight is a factor as well as battery life. If you decide to mix and match brands that might or might not work well for you. For instance if you found a great price on a 12v drill and driver kit (like Milwaukee or Bosch) and got a larger circ. saw that was 18 or 24 max volts at a great price, that might be workable, assuming you aren’t planning on carrying chargers on your bike, but just transporting only charged batteries. It’s complicated, no?