Certainly because TVHeadend as a long history with LibreELEC the biggest benefit might be the support from other TVHeadend users here. However being multi-plaftorm most questions you have will not be LE specific and so you can probably be helped best on the NextPVR forum. Being a NextPVR user since 2006 I am certainly biased but the simplicity of NextPVR doesn't mean that it is any less powerful or stable then TVHeadend.