You should buy what is locally available in your area with good support. If not then go for the Chinese tablets with Ublox Z-F9P GNSS. Pick any like Stonex, CHCNAV...just make sure the GNSS is the 184 channel Ublox Z-F9P. Excellent performance with CORS and works great with Field Maps. Without CORS can get you below 1m.
Samsung Tab Active4 Pro is good if you don't need cm positioning. Handheld Group of Sweden also make good rugged tablets.