Prune for one or multiple stems?

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Hello everyone,

I am new to this site and wanted to know some of your opinions on pruning.

I have just bought seedlings for this season from Craig (nctomatoman) in Raleigh. I bought these varieties;

Cherokee Purple
Cherokee Green
Opalka
Sungold
Nepal
Lillian's Yellow Heirloom
Orange Heirloom
Brandywine (Pink)

My question is should I prune to grow one stem and prune all other suckers or sould I prune for two or more stems?

I plan on growing five in 24 gallon containers in the yard staked and three in 20 gallon containers caged on the back deck.

Thanks for any help, John