T-slot&V-slot Difference

Hi all, I have recently purchased some 2020 T-slot profiles which are well made with a good finish and was just looking at V-slot prices for comparison

Cast corner: plpNaroznik-90-stopni-Natural217 T-NUT M5:

thor infinity reels slot T-Slot aluminum frames 8020 Extrusion Series Differences: Metric vs Fractional 23K

triple 7s slot machine T-Slot aluminum frames 8020 Extrusion Series Differences: Metric vs Fractional 23K