No question the non-grooved lower bearing would be stronger, but it's going to take a pretty strong argument to convince me that outweighs the need for the rod bearings to have constant oil pressure.
I just got back from a trip to Summit racing where I purchased 2 sets of bearings so I can piece together a fully grooved set. I plan to wait a day or so until I get feedback on this before I open the second set.
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Hoping to finish a project while I'm still able to push the clutch in.... 
1963 Tempest Convertible (195-1bbl, 3-speed transaxle. 428 RAIV, 5-speed, IRS planned) Pictures
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