Hi Lava is basically a zirconia marketed by a specific company, namely, 3M. So it is somewhat like buying a generic medicine or buying the same as a brand from a company. Zirconia crowns are also available with 15 year warranty. However, you need to understand that the warranty is restricted to replacement of damaged crowns due to manufacturing defects. It does not cover recurrent infections in the treated tooth/ teeth, fractured teeth or simple dislodged crowns that get misplaced, among other things. So you can decide as to what kind of crown(s) you would prefer, in light of these facts.

firstly which tooth you getting replaced if its back tooth then 3m lava and if clearance is less then zircon