What is great about the Ohm approach compared to typical lex/yacc/ANTLR parsers is that it avoids ambiguity by using ordered choice (the first matching rule wins), instead of requiring you to resolve conflicts explicitly. This makes working with Ohm/PEGs less painful in the initial phase of a project.
It's also important to highlight that this makes the parsing process slower.
It's also important to highlight that this makes the parsing process slower.