I take it that you are just rephrasing the age old riddle: focus on cash flow, or appreciation?
Trouble is: when trying to analyze in advance, BOTH sets of numbers are largely guesswork!
Over hundreds of previous threads on the topic, the consensus seems to be: try to find the "sweet spot" in the best (likely appreciating) market you can afford, that still gives SOME cash return.
Another trouble is: people talk of averages, whereas every property bought is SPECIFIC.
That is to say: we will NEVER be completely right in our Cash ROI or Total ROI pre-analysis!...
I personally look more at total ROI which included principle pay down. Appreciation can also be figured into the calculation but it is more of a guesstimate.