Need an opinion between two Xenon flashtubes!

I am building a high power 12V portable Xenon strobe light, and I am trying to make it as bright as possible so I need a few opinions here before I continue designing my circuit.

I am torn whether I should go with a 40mm round flashtube (rated at 100ws, **broken link removed**) or a smaller spiral flashtube (rated at 40ws, **broken link removed**). I am aiming for around 15 Hz (15 flashes per second), so I would be firing the round flashtube at 6.5 joules per flash (for a total of 97.5 joules per second) and I would be firing the spiral flashtube at 2.6 joules per flash (for a total of 39 joules per second).

My question is this: How much brighter would the 40mm round flashtube truly be than the spiral flashtube?

To fire the 40mm round flashtube at 6.5 joules per flash, I will need 144 uF at 300 volts per flash. Will I be able to fill 144 uF of capacitors 15 times per second to successfully fire the round flashtube a full 6.5 joules per flash?

Thank you to everyone for your help and ideas!

hi,
Will this be used with a focussing reflector for a directional beam.

Be extremely careful with a Xenon flashing at around 16Hz it can induce epileptic seizures in some individuals and other animals.

Can you say what is the application.??