The article came as the two companies traded shots over the annual result MYOB released on Thursday, which included a 16 per cent rise in revenue to A$287 million ($296 million) and a 15 per cent lift in operating profit to A$138 million.
In a somewhat unusual move, Xero dispatched a press release in response to MYOB's result.
The Wellington-based firm's managing director for Australia and New Zealand, Chris Ridd, said MYOB's 16 per cent rate of revenue growth - well below Xero's 82 per cent - highlighted the importance of having a multiple-market growth strategy.
In addition to Australasia, Xero is also pushing into the US and Britain.
The New Zealand company had just 277,000 customers in Australasia at the end of September - compared with MYOB's roughly 1.2 million - but is growing fast.
Ridd said Xero, which last week announced a $147 million capital raising with two North American investors, was adding 300 customers every business day in Australia, with more than 100 of those new users switching over from MYOB.
A MYOB spokeswoman hit back, telling another media outlet that Ridd was comparing companies with very different business styles, while also noting that the Australian firm's cloud user base had grown by 88 per cent over the past two years.
Xero shares closed down 30c at $24.40 last night.