sydneyc,
My understanding is that in the past that Modular was viewed by the airlines as a slightly inferior (This is purely anecdotal) however with the increasing numbers of quality Modular people out there it is becoming more widely accepted as being as good as if not occasionally better (?!?)
With regards using different organisations for the various portions of your training it think (again this is only my opinion) that it depends upon:
#1.Which airlines you are approaching, ie The likes of BMI, KLM etc.. would prefer it all done in one place vis a vis consitency of training, a known quantity etc..
#2 If its not your first job then I suspect it wont make any difference WHERE you did your training
At the end of the day 14 passes are 14 passes and an IR is an IR regardless of who trained you.
What it boils down to is its your personal situation and financial situation that will probably dictate where and with whom you train, personally I'm at OATS, whether the old chestnut of "OATS on your CV" makes a difference or not only time will tell.
Go for what works for you, I wouldnt worry about which airlines want which training provider, there are a lot more things to worry about and hoops to jump through before you have to worry about that.
All the best
TBL
edited for too many "At the end of the day"s