Same here. The 2b, 3b and Zero 2 have the best cost-benefit ratio. I recently migrated the Oberon System 3 to those three boards and particulary the Zero is a great host for this bare-bone system: https://github.com/rochus-keller/oberonsystem3native/. I hope the Raspi company postpones the end of life date of the 3b and Zero 2.