Crank scrapers or plate...?

Now that I'm down to it & even had my pals enginestand here I have a question about what to use...
I've been look'n at different options such as:
plates on the sides of the crank, fitted on the block &
the bended "upsidedpwn tunnel" plate that covers the whole underside of the crank & has slots & louvers that is fastened to the crank bolts.

To me it seems that the second option is the best, otherwise the moving parts will splash down in the oil anyway & if the crank parts are moving inside a kind of walled room in high speed then the oil won't flow back in as easy & stay more out of the way caused of the louvers on one side... can it be so?

Any experiences in this case?