When these types of TV first became available there were notable differences between the performance of each – LCD was better at fast-moving programs such as sport and Plasma had better colour-rendition and darker blacks.
Since then both technologies have been improved so that there is very little difference, if any, between the two.
With this in mind it is better to judge each TV on its own merits and ignore whether it is LCD or Plasma.
The old problem of Plasma’s needing “re-gassing” is now also something that is no more, with Plasma TVs being as reliable as LCD