I think they should be roughly in a similar range for selfhosting?! They’re both power-efficient. And probably have enough speed for the average task. There might be a few perks with the ThinkCentre Tiny. I haven’t looked it up but I think you should be able to fit an SSD and a harddrive and maybe swap the RAM if you need more. And they’re regularly on sale somewhere and should be cheaper than a RasPI 5 plus required extras.