I mean no disrespect by this, but are you saying you have one prosthetic leg? In your situation I'd say swimming, given that it causes no joint issues and at least with respect to that prosthetic leg, you would still be using your glutes.
Basically, I'd think in general what is best cardio is determined by:
- fat burning potential v muscle loss potential;
- your diet.
Any endurance work (at least in my observation) primarily involving hamstrings/glute (eg running) appears to result in greater muscle loss that quad dominant activity (e.g., compare even 800m runners - a relatively short event - to similar distance cyclists)
If there is any merit in this analysis, running, whilst potentially burning more calories, is more likely to result in muscle loss than cycling or rowing.
I mentioned diet too because the amount of carbs in your diet will influence your exercise plans. On a restrictive carb approach, LISS (Low intensity stead state cardio) is better because HIIT will result in muscle loss without carbs.
Some competitive bodybuilders who diet with carbs - e.g Layne Norton - do HIIT (sprinters for eg have good glute/hamstrings). For you sprint pool intervals may work.