Switch for RoCE: Mellanox SN3700C or Dell S5232F-ON?

Hello,

I'm looking around for new switches to support our new VMware cluster needs. Storage protocol will be NVME-oF/RoCEv2 (Pure Storage Flasharray), server NICs will be Mellanox Connect-X. We've been offered those two switches, Mellanox SN3700C and Dell S5232F-ON, for the same price.

Could you help me choose? Any thoughts about ONYX/RoCE or OS10/RoCE?

Thanks