Scores are out of 5, from a 2017 archive of gutter guard test results. Valor is first; the others follow in the archive's order.
1. Valor Gutter Guards
Perfect scores everywhere except value, where it earned 4.5; the reviewers found it had the lowest installed cost among the micro mesh guards. The raised S design handles heavy rain and inside corners.
2. GutterDome
A very strong, long-lasting guard with the top marks for strength and durability. Its dome shape can collect debris in a groove near the shingles.
3. Gutterglove Pro
A strong frame with very fine stainless steel micro mesh. It was a long-time favorite until later testing found that fine micro mesh can clog with grit, sap and organic growth.
4. Gutterglove Ultra
A lower-priced step down from the Pro model, with slightly less protection. The micro mesh was more likely to pop out of its frame in the drop test.
5. LeafBlaster
Gutterglove's do-it-yourself line. The archive lists its scores but never published the written notes behind them.
6. MasterShield
Early performance was good. Thin aluminum that can bow, and micro mesh that loosens over the years, held the score down.
7. LeafFilter
The review centered on micro mesh coming loose from a plastic frame and on how the plastic holds up in sunlight.
8. LeafGuard
A curved-nose metal cover. It tends to pull debris in during light rain and let water overshoot in heavy rain.
9. K-Guard
A curved-nose metal cover with the same light-rain and heavy-rain limits as others of its type, and a slightly better reputation score than LeafGuard.
10. The Original GutterGuard
A curved-nose metal cover from an older design family, scored the same as most others of its type.
11. Gutter Helmet
A curved-nose metal cover. Thin metal and a bracket system that can fail in summer heat kept the score down, and its reputation score tied for the lowest in the archive.
GutterMagic and GutterGuardian
These Quality Edge guards have no current scores. The earlier ratings were pulled for re-testing after the maker disputed the review, and the archive holds no update.
The story behind the ratings
Read the full story and more on Gutter Protection Review.