Target tension.: Whether the muscle you’re training is what gives out first, not your grip, balance or other muscles.
Loaded stretch.: How hard the muscle works while stretched. Training it there is linked to more growth.
Progression.: How easily you can keep adding weight in small steps over months and years.
Low cost.: How easy it is on your joints and recovery, and how quickly you can learn it.

The research score comes from these, scored by hand from the studies. Lifter scores appear once an exercise has 10 ratings. How scores work

When each one fits

Dragon Flag

Toes-to-Bar

You need

Bench

Pull-up bar

Skill

Needs coaching

Type

Isolation

Questions

Which is better for your abs, dragon flag or toes-to-bar?

For your abs, the two are close. Dragon flag rates slightly higher: more stretch. Toes-to-bar is easier on the joints.

Is dragon flag or toes-to-bar easier to learn?

About the same: both need coaching.

Can you do dragon flag or toes-to-bar at home?

Dragon flag needs a bench, so a home gym covers it. Toes-to-bar needs a pull-up bar, so a home gym covers it.

Which is easier on the joints, dragon flag or toes-to-bar?

Toes-to-bar: it rates Good for joint and recovery cost in our research rubric, against Fair for dragon flag.