Macbook pro 2020 * After Effects

It really depends more on your needs and of course the size of your pocket. If you do not have the money to configure a Mac with good tech specs, it is better to go for a Windows because with half of what it would cost a Mac you could get a very good one with Windows. But if you have the possibility of buying a good Mac, do it, as Rick says, don't skimp, maybe even in certain processes it can be minimally slower than a Windows with the same specs but it is very reliable.

Most of my AE work is on a Mac. If you don't go cheap on ram and graphics, the Mac is a very solid and dependable system. If you skimp on things, you are going to have both speed and reliability problems as your projects get more complex.