When comparing Google Groups vs Loomio, the Slant community recommends Google Groups for most people. In the question“What are the best collaborative decision-making platforms?” Google Groups is ranked 4th while Loomio is ranked 7th.
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Pros
Pro Free hosting
Pro Mobile Friendly
Pro Supports a wide range of decision-making methods
Pro Free and open source
Licensed under GNU AGPLv3
Pro Developed by a thriving social enterprise
Loomio development is led by a group structured as a worker-owned cooperative company, which is part of Enspiral, a mutual aid network of other social enterprises. As a result, both the Loomio code and the cooperative's hosted instance at Loomio.org are being actively maintained and developed, with new features being planned and deployed regularly.
Cons
Con Monthly fee for extra features
You generally must pay a monthly fee to support a group with additional features, integration options, and memberships cap increases (however, unfunded community organizations can apply to use it for free, and non-profits with a budget receive a discount.)