Help me choose a 'Single Codec' for conversion?

I am preparing my footage to edit a documentary which I shot using three cameras:
DVCPRO HD (1080/25p) Panasonic 171
H264 (1080/25p) Canon 5D Mk II
AVCHD (1080/50p) Panasonic TM700
My confusion is concerned with the DVCPRO HD stuff being 1440x1080 whereas the 5D and TM700 are 1920x1080
I want to convert all the formats to a single codec.
My question: - Should I convert everything to ProRes, or convert the 5D and TM700 footage to DVCPRO HD? I'm trying to understand if there are any 'disadvantages' to converting DVCPROHD to ProResas both are iFrame.... but am concerned about scaling.
Many thanks

Thanks Jim, i'm moving towards that viewpoint myself.
As a supplementary question, i'm curious if transcoding from DVCPRO HD to ProRes 422 will affect the image quality in some way .... I've tried this and they look the same to my eye, though going from one compressed file type to another suggests a loss in fidelity?
Thanks, Johnny

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