Replying to Power tool questions

Hello ladies and gentlemen,

I have a question mostly directed toward those in the trades but looking for helpful info wherever I can get it.

I'm currently shopping for a new cordless drill as my 15+ year old 14.4v Dewalt unit has developed a ton of slop over the last 15+ years of abuse.

I'm looking at new models and tool bundles and have a couple questions:
-Do I want/need brushless motors?
-Is there any real difference between the 20v Max, XR, Atomic

I'm a relatively experienced DIY guy and use my tools sometimes for random odd jobs at work but I don't run them all day so the 1.3Ah to 1.5Ah differences in battery life are of little consequence.

I'm looking at kits that include circular saws, reciprocating saws, multi-touch saw things, angle grinders which would just serve to replace old kit I already own in corded form as well as impact drivers.

Any other recommendations are appreciated.