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@Dammit
The one which uses the sandwich plate is, objectively, a nice design I think - it's non-trivial to fit, expensive, and shows that at least one owner was happy to spend time and money on the car.
But, that doesn't tell you whether it was installed well - and given that removal and installation of the IMSB can put a sideways loading on the timing system, which wasn't designed for that, you basically have to go on "how many miles has it done since" to suggest if there's likely to be a downside.
Honestly, I'd go on the overall condition of the car - which you'll get from your inspection.
How many miles/year/engine?