I believe it is better to snap suitable plants whenever possible as it finds a natural fissure between cells and does not transfer disease (most particularly botrytis later in the season) on the blade. With vines this is generally easy at any node. However, with the missed sideshoots on cordon toms, they definately get to a point of no return and cannot be snapped at the base without wrecking the main stem.
Regarding defoliating: It seems very early in the season. They are the plants energy generators and unless diseased should be left. Towards the end of the season it helps to allow better air circulation around the ripening fruit and concentrate the plants energies.
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