It totally depends on the application. DLP are better in terms of printing speed while SLA are better in terms of detail

This printer prints by curing plastic drawn line by line

So whats the ink for these Stereolithography printers?

There are only 9 common type of resin available

Image credits to Formlabs

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digital light processing (DLP)

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Tough ink

Flexible ink

Castable ink

Durable ink

Clear ink

Dental safe ink

Basic color

High temperature

Rigid ink

So which is better?

These ink for Stereolithography printers are called resins. They usually comes in bottles

Stereolithography (SLA)

After printing SLA prints must also be washed before use

The printer prints by curing plastic layer by layer