With twelve tall (indeterminate - cordon) plants in my small greenhouse competing for space, removing the lower leaves helps increase aeration around the base of the plants and helps prevent problems such as fungal disease.
This also helps tomato plants mature more quickly - they can give all their energy to the upper part of the plants growth.
When removing lower branches, give them a sharp pull upwards (trying not to damage the main stem). If you remove the stems with a knife or scissors, the blades of these can transmit disease from plant to plant, so it's best to remove by hand where there is no contact at the point of the open wound.
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