Liquid seaweed feed (i.e. on its own) is not a particularly strong fertiliser - it is rather classed as a tonic as it contains a full range of trace elements.

Mixed with other substances - like manure etc - it helps make a more balanced fertiliser.

Tomato feed sometimes contains seaweed but it is used for its particular concentration of potassium which encourages fruit formation.

It's up to you, basically - tomato feed is probably the most ideal for tomatoes, but obviously it costs extra.