You don't list your system so it is a bit difficult to presage your options. Personally, I prefer DTS to Dolby but have Blu-ray discs with all three formats.

Once the movie is on and I get immersed in the action etc I'm not aware of any sonic differences. (but I do quite like the THX, DD, DA sound demo's that you occasionally get)

I suggest the volume of each channel will make a noticeable difference but I keep mine at reference level as installed by AudioImages. However, I come from the 'as the sound engineer recorded it' school of thought.

I don't suppose this is of any help whatsoever.

Not far from N London if you would like a demo of mine.

DSP8000USE, DSP5200HC, DSP33, DSW1500, 808v5, 861v4, WiiM Pro+, Panasonic 55" Plasma, DMP-BDT700 Blu-ray,
MECOOL MEon1, Russ Andrews Signature Power Block, UltraFuses, SuperFuses, Kimber Signature PS Interfaces.
Prior: DSP7000.2, DSP6000.2, DSP5000.2, DSP5000.2HC, 508.24, 568.2, 596, G98DH & G68D.
Jaguar F-Type; Meridian 770W Surround System