you can convert it to number inside xpath:
select *
from ABCD
where xmlrecord.exist('/row[number((c9/text())[1]) < number((c10/text())[1])]') = 1
or compare values:
select *
from ABCD
where xmlrecord.value('(/row/c9/text())[1]', 'int') < xmlrecord.value('(/row/c10/text())[1]', 'int')