Marrying into existing frame wall.

Once again more questions,

Tomorrow was planning on finishing this floor and then starting to get some wall frames made up.

Existing frames are 70x35
I've always used 90x45, I'm assuming it would be easier to keep with existing but if I used 2x4 I could always batten out the old walls and re sheet ( I will have to re sheet anyway. )

From experience what would be easier? I'm leaning towards a 70x35 frame, but would I then need to have studs at 450 instead of 600? Double top plate?


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