The Sd 200 is simply a better made servo. It does not strip as a rule. I have put it through hell and still not had a strip. I have had a motor go before the gears stripped.

The dimensions are on one of those pages.

Heres a copy and paste:
SD200 Mini-Ballraced
TORQUE------------------2.5kg/cm

SPEED---------------------0.14sec/60deg

DIMENSIONS----------29.5x25x13.9mm

WEIGHT------------------16g

Cheep too at only 12.95.