At this point in time, the following links are well written on both vulnerabilities & their potential for manipulations. 

Latest status & further developments from ISC as of JAN 8th

https://isc.sans.edu/forums/diary/Meltdown+and+Spectre+clearing+up+the+confusion/23197/

Excellent educational & detailed article — sectionalized by each chip major & major vendors … At this point in time, it is well written on both vulnerabilities & their potential for manipulations

https://arstechnica.com/gadgets/2018/01/meltdown-and-spectre-heres-what-intel-apple-microsoft-others-are-doing-about-it/

Cloud impacts are more about multiple users being all exposed at once — as hackers could hit the lottery v. single users

The CPU catastrophe will hit hardest in the cloud

https://www.theverge.com/2018/1/4/16850120/meltdown-spectre-vulnerability-cloud-aws-google-cpu