The 130 screen is smaller. But because it’s grayscale, I found it easier to read than the 530/830.
One thing the 130 (or plus) doesn’t have is power alerts. The 130 series supports time-based and distance-based alerts, but not heart-rate or power range alerts (so you can’t set it to beep when you exceed a target power or heart rate). The 530 is the lowest Garmin bike computer that supports those.