My first thought is, go with amps for more power.
But, if Mike has the kobalt and gives it thumbs up, is good enough for me.
I have the 12" dewalt non sliding saw. It does fine for most things and am happy with it.
If all I did was finish stairs, newel post, pickets, hand rails and such.
I would prefer a smaller 8" saw.
The reason is blade surface and flex. I learned this from the days when I was a apprentice.
My boss had a 12" dewalt we used all the time for finish work, when a set of stairs came up, he pulled out the 8" milwaukee. He got a better cut with it.
20 years later, I notice it all the time cutting a fat piece of oak with my 12" saw, the blade deflects and cut is 1/2 a degree off.
I know to expect it, plan for it and how to fix it. Just saying bigger is not always better.
More amps and power is always better.