Neither of these cases accept gen parts PERIOD. And the first thing to remember is that if you want any gen parts (minus the crown) then forget using either of these. These are what I refer to as "oversized" cases because the dial they accept is bigger than a gen, the bezels are bigger and so are the inserts. As a result the hands need to be longer. So these are BUDGET. Parts are sourced from HR, Raffles and Tiger for these builds, the results can be very good but, there is little point saying that gen spec parts don't fit so they are no good. These cases are what they are and can produce a half decent build.
Here is my budget build with a silix case
http://www.rwgforum.net/topic/172961-silix-6200-budget-build-complete/?hl=%2Bsilix+%2B6200
As for which to use from these two, even though I have used Silix and the results can be ok, I would probably say HR, with HR dial and hands, Raffles insert because if you do the plexi properly I can be made waterproof and the Silix is very very hard to get water tight.