Not Ranked
The issue with HTOB is some of the junk ones on the market. When dealing with quality, fewer moving parts equals higher reliability. HTOBs lack of an arm and pivot also results in a more direct transfer of energy. HTOB is lighter. Only way I'd go external is if I was doing some serious drag racing where I might melt the seals with heat.
If pulling the tranny is a major job, I'd be more worried about the design of the car than the throw out bearing anyway.
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