4,000 counts is a loss of one digit of resolution at 5V compared to 6,000 counts. A valid negative in that specific circumstance and others.
For example, a lot of popular bench power supplies have a 10mV resolution display, so it is very nice to have a DMM that can exceed that, such as 50,000 count.
Published accuracy specs are not as reliable a metric as it would appear. Some companies are conservative while others push it to seem better than they are.
Checked some reviews on the AM-530 and two big negatives are it defaults to ACV when powered on and the continuity beep is very slow.
The BM235 is fine if you're on a tight budget, but if you have any money to spend on your electronics hobby, it could quickly become a toy compared to what else is out there.