Hena I suggest mounting them on flying bases and not taking them off. then you have to accommodate two titan sizes areas which is easy enough.
As for 200 vs 200. Take the EpicUK stats and compare to a regular brick.
Both loaded for ease of comparison with 2 devs (leaving crusaders etc out).
Regular - FF - 2x4+, 8x3+, unit count 10, 1/24 chance of crit from each hit, can take two points of damage (RA4+)
THT - FF - 8x6+, 8x3+, unit count 14 and mobile afterwards, 2/27 chance of crit from each hit, can take 2 damage each and will typically 'spread' it over the formation thanks to the WE targeting rules.
I think in near every situation if something can take Rhinos I would want it to have rhinos for that drop, with the slight increase in fragility compensated by numbers and firepower.
Incidentally is the 3 strong formation needed? Does it not duplicate the Landing Craft?
Can I be on the London rules committee? Maybe for the Indian sub continental branch?

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