Question

which group pisces or amphibia is advanced

Answer 1

I think amphibia is advanced as the can live or survive in both ground and water but Pisces don't. They need water to survive but it is not a necessary condition for Amphibia.
Hope It Helps :-) 

Answer 2

Fishes are the Amphibians advanced pisces because:-

Amphibians have adapted to live both on land and water

They lack scales

They have three chambered heart

Respiration is through gills or lungs

Explanation:-

The amphibians have developed the capability to survive in both land and water while the Pisces can live only in water

The amphibians have a three chambered heart which is more advanced than two chambered heart of Pisces.

Amphibians have lungs for respiration and other internal organs similar to higher vertebrates while fish have gills 

The body shape has advanced in amphibians with the tail gone and the scales have been replaced with a smooth skin in most cases while Pisces have a streamlined body with tail and scales to survive in water.