The verdict
If Google Ads already works, test Microsoft Advertising with the Google Import tool and a modest budget. It is a copy of what works, not a new strategy. Judge it on cost per lead after a few weeks.
If you run campaigns on several platforms and checking each by hand does not scale, add Adzooma. Its free plan lets you try it without commitment.
I would not look at Adzooma before you have campaigns, and I would not expect Microsoft Advertising to scale a business alone. Set up conversion tracking before you spend on either.