The verdict
For a small team, pick Microsoft Advertising first, and only once Google Ads already works. It gives you a second source of search intent and a benchmark for what a click should cost. A modest budget is enough to learn whether the audience is worth having.
Pick Optmyzr when you manage real spend across several accounts and the routine checks have become a weekly burden. A small second channel does not justify a paid management tool on its own. The tool pays back through the rules and audits when many accounts and a large budget are involved.
If both apply, start with the channel and add the layer when the workload demands it.