Forerunner 45
Retail: $200
Garmin's entry-level watch. Good for basic running/biking/cardio tracking. Two versions, the 45S (smaller) and 45.
Reasons to Pick the FR45
EASY TO WEAR
The 45S is 20% lighter than the 245, and the 45 is 7% lighter.
CHEAPER PRICE
Save $100-150.
Forerunner 245
Retail: $300-350
Well-suited for more dedicated runners going for PRs. Comes in a music and non-music version.
Reasons to Pick the FR245
MORE TRAINING STATS
Training Status, Training Effect, Recovery Time, Race Predictor, PacePro
MORE ACTIVITIES
Also tracks pool swimming, strength, and indoor rowing.
Learn more in my in-depth comparison.