Am I fooling myself? (PAM vs BLDC)

Do PAMs really have much benefit over motors?

Some (subjective) pros & cons of PAMs vs BLDC motors for this application:

Pneumatic Artificial Muscles	Motors (& gearbox)
+ Powerful for their weight/cost. + Fast.	- Have to trade speed for torque. - Do I have the budget for big enough motors?
+ Negligible weight for muscle itself. - Weight of valves (400g each) & compressor (2.88kg). Reservoirs planned to be 2L soft drinks bottles (tested to 90psi).​​- Fittings, pressure sensors, regulator (all non-zero).	- Weight of motors & gearboxes or lead-screws. Small KEDA 28-30 920KV Brushless Outrunner weighs in at 57g.​ Larger Turnigy Aerodrive SK3 - 5055-280KV Brushless Outrunner: 570g. ​Larger Turnigy Aerodrive SK3 - 5055-280KV Brushless Outrunner: 570g. ​
+ Inexpensive, even including cost of 3-way solenoid valves. ~£11 per DOF. + Single small compressor (85lpm) for ~£30.​ - Fittings & accessories should be considered (all non-zero).	+ Small BLDC motor ~£9 ​- Larger (more torque) motors cost more. £40+ for bigger BLDCs. - Required ESCs can be costly too(?)
+ Compliant: built-in suspension for both rolling and walking.​ + A degree of safety around those pesky humans. ​ ​- Difficult to position​ and lack of rigidity would make balancing (future!) more difficult. - Limited unpowered support - collapses when not powered, so no static display or maintenance​.	​​​+ Easier to position​​. + Gearing that isn't back-driveable would automatically lock limbs for static support.​ - Could be too rigid?​​​​ Transfer of shock.​ Not compliant to terrain.
​- Air demand could outstrip supply. Compressor choice & reservoir size have major impact.​- Compressor current ~30A.​	​Current of multiple BLDC motors?​ Small KEDA 28-30 920KV Outrunner max 7A​.Turnigy Aerodrive SK3 - 5055-280KV max 60A.​

I'm concerned about the speed-torque trade-off with motors; I guess that's solved with bigger motors but that has weight and cost implications. PAMs seem to have plenty of power but I'm fairly sure I'd be shortening the life-span of the solenoid valves by operating them at high rates and it would be a huge PITA to have to switch to motors, because of reliability issues, once I'd committed to PAMs.

Maybe a hybrid system? Best of both worlds or twice the weight, power consumption and complexity?