Personally, it would be great to have either station in Nassau County. My brother lives there and it's true, FM Radio is absolutely worthless. I used to listen to the reggaeton station (92.7) when I was out there, but even that has been replaced now. Unless you like soft rock, trucker rock or brain-dead modern hip-hop, you will hate what this market has to offer on FM Radio.
Radio-X was terrific, probably the station most reminiscent of the late WDOX in South Jersey. They played lots of classic punk, post-punk and harder rock as well. The diverse playlist kept the station from ever getting boring. But like all good things, it's coming to an end. It will be missed.
WLIR is also excellent, but definitely more retro-leaning - not that there's anything wrong with that. I have listened to their webcast a few times and they sound far better than they did during their last few years on 92.7 - they eliminated the Mom Rock and cheesy dance-lite pop music from their playlist, while moving closer to their roots. They do play a good selection of currents, though some of them are head scratchers (Gym Class Heroes? Norah Jones?). Hopefully the new owners have a plan in the works to cover all of LI with WLIR. The airwaves are a barren wasteland in Nassau.