SN2010, ConnectX-4LX, MLAG/RDMA with Hyper-v - Cable Recommendations with this configuration

Hello, just purchased a pair of SN2010s to configure as an MLAG pair ToR switch set for Hyper-v clusters with ConnectX-4LX Nics. Looking to understand if there was any reason not to use the 100GbE to 4x25GbE Direct Attach Copper splitter cables in this setup as there are 4 servers in a cluster, and with Hyper-V/MLAG/RDMA/RoCE, would either -N ( no FEC ) or -L ( FEC ) be more or less preferred?