But which method is better? Is there a difference?
I ran some tests, reviewed the logs, and weighed the glue cartridge: a Test Model takes 15 minutes, uses 8 grams of glue, and consumes some PVC material. The Clean Bubbles routine takes about 1 minute, uses 5 grams of glue, and doesn't consume any other consumables.
So Clean Bubbles is better, faster, and more economical.
Bubbles in the glue lines tend to resolve themselves, but it's nice to discover how trivially easy it is to prevent the problem in the first place.