Not sure there's any advantage to OEM over aftermarket calipers or even rotors but for pads, I like the OEM pads myself.

As for tools, other than a standard metric wrench/socket set I also use a big c-clamp to help compress the caliper fully. A one man brake bleeding kit may also be helpful.

Luckily I haven't had to replace my rears yet.

HTH.

Off Roader
98 Montero with the Winter Package
89 Montero minty clean and reserved for overlanding trips or Cars and Coffee events
96SR (3.15:1 xcase, 35's) gone to the rust gods
96SR Build Up Thread
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