The honest answer
The difference, and who should actually decide.
Short answer
They're absorbed differently, and the research on each differs — there's no one-size answer. Which form makes sense depends on you and your situation, and it's a question for your physician, not a rule of thumb from a forum.
Route of delivery changes how much reaches the target tissue and how quickly. The evidence base isn't the same for each form, so a blanket 'this one is better' claim gets ahead of the science.
A physician who has evaluated your injury can match the approach to your situation. That's the honest answer to a question the internet loves to oversimplify.
Straight answers
There's no universal answer — they're absorbed differently and the research differs. The right form is a physician decision.
How it's provided is part of the physician conversation; the form that fits you is decided in evaluation, not off a webpage.