Basically more powerful, but I think that there were one or two elements of functionality that were removed, in order to reduce the battery drain.
Remember that the M1 was the entry level dap, and the M0 is the relatively recent dap, that builds on the experience gained with the M1 dap.
You can also use the hibylink app to control the shanling daps, using a phone or tablet, so the small dap screen size need not be an issue.
For sake of correctness the M0 does not use the Hibylink app as the OS is in house Shanling not Hiby. I do not believe they have released that feature for their OS as of yet but it is in the pipeline.
@almarti I use my M1 everyday as a transport to Mojo, I play every format from MP3 320K to 96 Flac and they all sound significantly better thru Mojo than DAP alone either my M1, X3II or iPod (wifes using everything converted to AAC via DBPowerAmp).
As far as battery issues, I've had Mojo for quite some time and still get a good use of 2 to 3 days while at work, @ 3 hours a day, I charge over night a home. No issues.