Lennox hot surface design is probably better, but why compare
ignition systems?

You look at two paintings and compare the screws in the frames....

Lennox parts are always significantly more expensive to replace.

G61V - 2 stage heat variable speed blower, heat X 20 years.
UGRA - single stage, heat X - life

UGFD/UGGD modulating input variable speed blower

UGRA is no match for G61V