Really hard to differentiate for PostgreSQL usage, both are great options. The main difference is that TablePlus supports a lot of other databases. I slightly prefer how Postico does things, also it has better PostgreSQL support (TablePlus is good but not great with arrays, hstore etc). I think the only thing that puts TablePlus ahead for my usage is being able to filter columns when viewing a row. I have some tables with maybe 40-50 columns and many similar column names so browsing with Postico can be a bit tedious.