Yes it would be for a couple reasons:

1. Phoenix has splicing enabled, enabling lower fees.

2. Mutiny has been making a lot of design choices in favor of privacy over user experience. If privacy is a higher priority for you, your choice may be different.

3. ACINQ has a lot longer of a runway to continue to operate as a company, judging simply by the size of their node. Mutiny is still in pre-seed startup phase, which is in itself a risk that they may not continue to operate.