I would think amazon would be doing rally well.
Buy!
In the last month, Kroger has gained 6.3% while Amazon has lost 15.6%.
The P/E ration on AMZN is 45 vs. 14 for KR. AMZN has a Beta of 1.3, KR of .17. KR pays a 2% annual dividend (dropping because of the rising stock price); AMZN pays 0.
I'd rather own KR. It is also a lot more affordable at about $35/share than Amazon at $1825/share.