I’m a pretty intense weekend carpenter. Taking a break now because I’m installing new windows on a third floor.
I am a ******* and have many battery platforms and use them all regularly. For the most part I like them all. It’s really hard to go wrong.
Here’s my advice: if you are an occasional user, you probably won’t benefit from 18/20V. The brushless 12V, hell, even brushed 12V tools kick ***. I think the attraction to 18V drills and drivers is that you can use the same batteries for other tools that absolutely require 18V.
But!!!! In my experience, the “other tools” are saws and things that need 18V and also need high amp hour batteries that you fundamentally don’t need for your drill drivers. So you really end up not sharing batteries that much.
I think there are many advantages to having smaller lighter hopefully cheaper batteries and more of them, rather than a few heavy bricks on the bottom of your tools. I would look at home center available 12V tools.
No scare mongering: one thing that keeps me up at night is the thought of run away li Ion batteries burning my projects down. When guys dissect generic tool batteries, they often find identical cells to the name brand. Some actually show superior power delivery. But the battery management chips are always different and many appear to be garage (Chinese sweat shop) made, That circuit board senses the power in the cells and stops the battery charger’s current from over charging the battery. The chargers themselves have a similar circuit and are typically called “smart chargers” because of it. I believe both must fail to get a run away.
Advice number 2: I’d pass on Bauer or any new platforms. I’d stick with the bigger name brands and only buy name brand batteries that you are certain aren’t counterfeit. And maybe advice to all, maybe yank your batteries off your chargers at night or connect them to a power supply with a switch.

One downside to 12v tools I’ve never ever heard discussed is how you attach them to a belt. This hook fits any belt and hooks any tool with a battery of this shape (even this 12V right angle tool). This is the only exception I can think of for not wanting 12v