if you think you want all the goodies on the chameleon, I'd def get an fpgaarcade over chameleon.
The Chameleon core is not open source and I doubt you will see it on the FPGAarcade.
The FPGA64 which started on the C-One is vastly inferior VIC emulation to Chameleon.
I have tried almost all the FPGA commodore 64 cores on all the different hardware and the only one to almost get it right and has continual development is the Chameleon.
Another issue is the CPU core as well. A lot has been improved since the FPGA64 core on the Chameleon and since more FPGA c64 cores are based on the FPGA64, they would have a lot of work to do to get it close the Chameleon.
I do have to warn that the Chameleon CPU core is not 100% yet but it is the closest. Even when it is not in high speed mode, the biggest issue is the CPU compatibility a lot of the time.
I think you would be surprised on the amount of software that does not run well on the non-chameleon FPGA cores. I was not impressed with the others as a C64 replacement. Chameleon is the only one that has gotten closest