Im relatively tall at just over 5'8" of slim/medium build and I have found that in regards to strap length, the reissue 226 is the best for me. Its the only chanel flap that looks good on me all three ways (crossbody, shoulder single and double chain). Medium large works well on me as a shoulder bag but some find may find it a little short. The jumbo for me is a double strap only bag... even at my height, its still long worn as a single strap and because its so big, it doesnt sot right cross body.
If youre looking for a mini bag, well that will depend on how you're going to wear it. Cross body options wise, the rect mini was definitely the best but on the shoulder i do think its a tad long. I really love the square mini actually. Its really perfect as a small shoulder bag on my body. Now the thing is, with bags its not necesarrily your height that will make a bag work or not, its really your body length. I can wear the square mini cross body and personally, I think it looks fine but most have said that the square mini chain is too short.
If you're looking for a boy bag, either the new or old medium seems to work. the old medium is better cross body though as its slightly smaller.
I'll try find pics of me wearing the bags or if I have time I'll take mod shots for ones I dont have pics of.