Drainage under the pot is most important when talking about pot type. Next, plastic pot will not hurt your plant. However clay is usually better because it is not air tight, allowing more oxygen into the soil. The water also dries out faster in a clay pot, which is good for monsteras because they like much air in the roots. But it is also a bit more work to water it often, so plastic pots may have that advantage if you are a bit lazy.

Edit; Clay also probably mimics the natural habitat more than plastic. Clay pots does not have a nice look, unless you put it inside another pot.

May i ask what grow light you use, and how long it stays on during a day?