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All three materials are widely used in gloves. Cow leather is a good mix of comfort, abrasion resistance and price and therefor is the most popular. Goat leather is softer and offers more comfort and feel, but is less durable than cow leather. Kangaroo leather is comfortable, soft and durable, but is far more expensive and is usually only used on the top model gloves.
There is no right or wrong in this one, it depends on your position on the bike. For example on a sports bike while its raining you have the chance that water from your sleeve will run back into the glove if you wear the glove over the sleeve. But on a chopper water from your gloves could seep into your sleeve.
To determine the correct size, measure the circumference of your palm with a soft measuring tape, just below your knuckles. You don't measure the thumb.
Your hands are the most important part of your body to operate the bike. Your hands are also the most sensitive to temperature changes. As a result, you don't really want to compromise on the heat regulating properties of your gloves. In the summer you want ventilating gloves, in the winter they have to be warm and waterproof and in the intermediate season you often prefer a thin glove (for a lot of dexterity) that is windproof and possibly waterproof. A glove simply cant truly be all those combined.
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