Rib vs Interlock Knitting

There are many differences between rib and interlock knitting, although

both are double jersey knitting.

Topic	Rib Knitting	Interlock Knitting
Knitting bed	Knitting done by double bed machines	Knitting done by double bed machines
Needle sets	One sets of needles in each bed	Two sets of needles in each bed (Short & long needles)
Cam tracks	One cam track in each bed	Two cam tracks in each bed
Needle position	Needles in two opposite beds are in between	Needles in two beds face each other- short needles faces long needles and vice versa (Conventional) or dial needle stays in opposite position than cylinder needle (modern).
Yarn per effect	Each rib course is made of one yarn	Each interlock course is made of two yarns
Appearance	Fabric has rib appearance	No rib effect
Surface feel	Fabric surface is rough	Smooth
Extensibility	Highly extensible specially in widthwise	Less extensible
Compactness	Less	More
Dimensional Stability	Less	More
Machines	Simpler and less costly	Complicated and costly
Interchange	Interlock knitting is not possible in rib machine	Rib knitting is possible in interlock machine
Structure

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Reference:

Fundamentals & advances in knitting technology- Sadhan Chandra Ray