In the office my setup is a dual-monitor Windows desktop for large-scale programs such as Tableau, SAS, and TOAD (corporate data analysis stuff). I've also got a Mac Mini off to the side which is rarely used, and is simply there to mostly AirPlay to the 75" TV in the conference area about 30 feet away.
I carry a early-2015 Macbook Air around with me all the time. It's my personal computer, but I get a good 75% of my 9-5 work done on it as well, in addition to 100% of my side work, so it's a real workhorse in that aspect. I love the thing and have never had a single issue out of it.
At home on my desk is a mid-2009 Macbook that is relatively slow. I use it when I need a second machine for some of my side work. I'm looking into turning it into a home automation hub and increasing the RAM in a year or so when we find and move into a house. I'm all about that life.
I've also got an old Dell laptop the company provided for me when I started to use to VPN into my dual-screen desktop when I work from home.
So tallying up my time spent on each:
80% Macbook Air
10% Windows Desktop
5% Windows Laptop
4% Mac Mini
1% Macbook
My ideal setup plan for Operation House is:
15" Macbook Pro 2.8GHz 16GB RAM 1TB SSD
External 27" Thunderbolt Display
32GB iPad Mini 2 with WiFi and Cellular
That's all I need to get everything I want to get done done.