How will you get from your home to Reinfelden station?
How will you get from Muttenz station to your work. (and vv)

Check at Reinfelden CFF/SBB station for price of a monthly or annual season ticket. Also ask for First Class price. Always less crowded, but not always near to the on board toilets.

Train journey is 12 minutes

Toilets at CFF stations are notoriously bad and always cost money. (The one at Nyon is often out of service(. You will have to check out the route to see if there are cafes etc at each station that you might be able to use.