What would be good way to test the FF render speed between computers?

I have one computer and one laptop with very different configurations, and the laptop.

So, I want to compare the FF render speed between both computers, but I am asking you possible sugesstions that could help bring the best possible results that could really show the difference and be able to test the difference of render speed.

Should I use only filters that are using only FF generated graphics ?

So this way it would not depend on any external graphics source and could be changed the resolution without problem.

Or should I also test other filters with images and make specific resolution sized images for the test purpose?

I can make images of fixed resolution sizes in the same way as I could make with the first FF generated graphics so they could be compared.

Please can you suggest what filters that you know I could use to test the render speed in the best way ?

It should be some fast filters, some medium speed filter, and some slow filters.