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Mafell A10M
Any reason you'd go Mafell over Bosch, Metabo, Milwaukee? They've all got 10.8~v drivers with that chuck system now. I've got a Mafell track saw, but I'm not sure I'd want to commit to their 10.8v platform.
Nef-
As a sidearm that can live in a (tiny) bag or pocket it's appealing. For me the fact that you can use the centrotec system easily with it if you want it is appealing. That probably puts it over the edge for me.
Bear in mind I'm mostly joinery and property maintenance so my use case is quite close to diy but not quite as rough and ready as carpentry or full on electrics and well clear of the state most builders get themselves into! I don't need to put up scaffolding with it, just need it to hang gracefully and reliably from my holster pocket as I pop a door on its hinges. The small Festool has amazing slow control too, so handling smaller screws is easily possible. Torque control is real and reliable which comes in handy if you don't want to ruin your elbow.
I'm also piloting almost any new screw holes since that's best practice by far. I can understand there are times when you want to percussion drive 100 10" bolt head screws bare back into a sleeper but that's not my style and the finish quality wouldn't pass muster on my jobs.
For larger holes like door lock body mortices etc. I use a hand powered drill with some ancient forsteners you can pick up on Ebay in sets for silly money. It's much easier to control the results and fast enough.
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I suppose you could make a good argument for buying 3 different drills for the same money since that would speed up any job more than having just one drill. Then you have to store 3 drills and most people seem to struggle to find space for a toolkit.
Airhead
Makita have a slightly different approach as they standardised the voltage of their batteries and use doubles or quads to power the bigger stuff like leaf blowers or lawn mowers. So for battery compatibility across the range they are probably most consistent. Amperage can vary of course.
Bosch seem to be the battery of choice for alternative use power like electric bikes. Not sure why that is but you could have a battery that powers your tools and bike in the future.
I still stand by the Festool TXS recommendation, that or the Mafell A10M which is a rebadged Metabo but allows you to avoid the centrotec system. Buy the best tool you can afford, quality is remembered after the price is forgotten etc.
I have 12 and 10 year old drills from the Festool range that are still in daily use with their original batteries. Nothing I had in the years before that came even close, battery performance has improved but the ever increasing voltage numbers game aspect of it is bs mostly.