score:6
I was in Albuquerque this last week. The City Bus terminal is next door to the Amtrak station. From there you can take a number 50 bus to the airport for $1 per person (and they take $1 bills inside the bus - not sure about coins). This is a local bus and takes about 1/2 hour to get to the airport and runs many times per day. This is the bus that I took.
Alternatively there is the number 250 bus which is an express direct to the airport and is advertised as being free. This bus doesn't run as often as the 50 bus, and its schedule didn't match up with my needs - which is why I took the 50 bus.
See City of Albuquerque Bus Routes & Schedules for more details.
Upvote:2
Use any search engine, Expeia, Kayak, etc. to search for cars at the zip code of the Amtrak Station.
Many agencies have off-airport locations. This is frequently better because you save airport taxes and fees.
Then determine the best way to get there. All things being equal, I would use Uber.