@sapstar While better if you search or start a new thread for more opinions, I would advise that you buy one of each, or even multiple of each, as you can reflash either of those to a dedicated Zigbee Router device by using USB-changer(s) for powering them, and it is highly recommended to have a few “known good” Zigbee Router devices. Read and follow these tips → https://community.home-assistant.io/t/guide-for-zigbee-interference-avoidance-and-network-range-coverage-optimization/515752
As mentioned, if ever going to use Zigbee2MQTT/Z2M then using a ZNP radio like the CC2652 based ZBDongle-P is the only recommended way to go today, (because EZSP radios like the ZBDongle-E support is still missing a couple of key features Zigbee2MQTT/Z2M to be in feature parity with ZNP).
ZBDongle-E can be reflashed to support Thread (for Matter support) or even Multi-PAN RPC for running Zigbee and Thread at the same time, but personally I recommend only using one protocol per dongle, so the best will be to use two separate radio dongles for Zigbee and Thread regardless of radio type used.
If using the ZHA integration then migrating radio type from one type to another type is very easy to migrate and no repair is required if going between ezsp, znp, and deconz radios → https://www.home-assistant.io/integrations/zha#migrating-to-a-new-zigbee-coordinator-adapter-inside-zha