I made some tests with the different parachutes in the following setting:
- Mass of the vessel: 6.64 ton
- The number of parachutes is chosen so that 0.6 ton of mass is reached for each parachute type
- Deployment of the parachutes at a higher altitude so that at 500m altitude an equilibrium for the velocity is reached
And the results are:
Parachute
# of Parachutes
Velocity at 500m altitude
Mk16-XL
2 (300kg)
8.4 m/s
Mk2-R
6 (100kg)
4.0 m/s
Mk25
3 (200kg)
50.2 m/s
Mk12-R
8 (75kg)
27.0 m/s
Mk16
6 (100kg)
6.5 m/s
It looks like the radially mounted parachutes perform much better (masswise) than the others.
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mhoram's post in TWR of parachutes? was marked as the answer