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Non-greasable (solid) u-joints are stronger than greasable (drilled), but it is a very, very small amount (assuming all else is equal). When you drill the small grease channel in the middle of the round cross-sectional area you simply don't decrease the strength of the part that much. Same calculations for determining the strength of tubing. If you have 1" tubing and go from .125" wall to .250" wall you have doubled the wall thickness (increase by 100%), however the strength only increased by around 35%. In the u-joint the equivalent wall thickness between a greasable and non-greasable is probably only around 15% different which would equate to maybe a 5% difference in strength. 5% is 5% but in the real world if you broke a greasable u-joint on the trail there is a good chance you would have broken the non-greasable version in the same situation.
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