transport from bergen airprt

Depends on what you mean by "best". Fastest or cheapest.

https://www.nordicchoicehotels.com/clarion/clarion-collection-hotel-havnekontoret/

From Bergen Airport, Flesland Airport train to Bergen Station.

By taxi We recommend Bergen Taxi, telephone +47 075 50.

I'm not sure about the hotel's reference to an airport train.

https://avinor.no/en/airport/bergen-airport/to-and-from-the-airport/bus-and-taxi/bus

Airport bus – Flybussen / TIDE The Airport bus TIDE follows two
different routes to the city centre; via Lagunen/Fjøsanger or via
Oasen/Fyllingsdalen. The last stop is at Radisson Blu Royal Hotell at
Bryggen. The first bus leaves Bryggen at 03:25. Departing every 15
minutes from 06:00-20:00 from monday-friday. Last departure from the
airport coincides with the last scheduled flight. Schedules:
www.flybussen.no

Local bus Bus 23 to Loddefjord and Storavatnet (monday to friday) Bus
56 and 57 to Nesttun (Change bus at Birkelandskrysset) Schedules:
www.skyss.no

We arrived in Bergen by train and just walked. (Our hotel was on the other side of the harbor).

The airport bus, "Flybussen," stops at Radisson BLU Bryggen is right next to your Clarion hotel: http://flybussen.no/Bergen/