My 106 steers tighter to the left than right and I like it (and keep it) that way for one reason: mowing.
See when you mow usually you keep your deck discharge chute on the outside so that you blow the grass into the area you've already cut. This results in making mostly left turns, many of which need to be very tight turns.
Therefore having the ability to make very tight left turns is helpful for me when mowing.
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147
R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)