As Dave said, the model of both would be helpful. Is the Rikon the 70-050 that is/was on sale?
All things equal, I would take a 12” swing over 10”.
What MT do they have, a 2MT is better an a 1MT (easy to fine attachments)
What size spindle? A 1X8 may be better over some other size.
What are the amps of each? I believe the above Rikon has a 6.6 amp and they call it ½ hp, another manufacture has an 8 amp (<25% higher) and they call it 1 hp max.
Do both have electronic speed control?
How old is the Jet? Are parts still readily available?
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety. Benjamin Franklin