Would you remove both implants or try to rescue one?

Authors

71 y/o male with failing implants in the lower right (#30 and #31). Most distal implant(#31) has suppuration. Would like to know if you would remove both implants and rebuild the area with GBR(allograft/titanium reinforced PTFE membrane/tacks), or try to keep the mesial most implant(#30) and still do GBR with burying the implant?