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NetBSD is beyond based but it is like stepping back in time. Take pkgsrc their ports and package manager you will need to configure it by hand if you want to use it but on the plus side it is trivial to host a copy locally and deploy your own package server.
Open BSD is a bit easier, has great tbinkpad support, and is actually used by the devs.
Go with either but keep the documentation handy. You will basically have to roll your own system from scratch after you finish the install.