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You can use either device, I use Tactrix. Decision was mainly based on the fact that I was able to define (with RomRaider guys and Td-d's help) RAM logging addresses for my ROM before OFT had support for them, and I can apply whatever scaling I want to the parameters being logged.
I get logging of multiple parameters at 20-40Hz with Tactrix and process my logfiles in a batch quickly with MatLab.
For hacking the ROM, either device pulls a ROM file that you can hack. If you're interested in poking through this with IDA, I have traced a few things in the ROM - a lot of indirectly referenced info is quite hard to find (for me). KPIT GNU tools are also useful for seeing how the Renesas chips process the indirectly referenced code.
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