In your example, the group isn't doing anything. The LEM rules engine actually does a lot of stuff in the background to simplify convoluted rules, so both examples are probably actually working identically in the background, so it's just cosmetic.
If you're going to have a lot of IPs that you're looking at, it will probably be easier to create a User Defined Group with the IPs and then us that in the rule instead of a line per IP.