And I recommend FitzQuake Mark V because it's the most authentic Quake sourceport engine (weapon popping, skybox moving, portal drawing), it has convenient build-in crosshair 2 (dot) and various bar settings (normal, gl, quakeworld like) with addition of few special effects (not needed). Yes, it has support for Nehahra but not Nehahra movie (incorrect pallete, wrong skybox) and Warpspasm works properly compared to Quakespasm.
As for the Arcane Dimensions all maps except ad_sepulcher works properly in single-player. In multiplayer there are issues with limit data (missing animation, sounds, etc.)

Quakespasm 0.93 (latest) has full support for Arcane Dimensions though, but i suggest to use SimonOC' modified 0.92 version, quakespasm-spike-admod.exe (very nice effects) for that mod.

I don't know for anyone else but i hate crosshair 1 (+), editing gfx.wad is a pain, and for some reason normal dark Quake portals look like portals from Lost Chapters / Quoth mods in Quakespasm 0.93, in Mark V classic Quake and Quoth portals look as they used to be.

Lastly it's super easy to create a server in Mark V (with simple port 26000 forwarding enabled in router settings if needed) and play with you friends all supported mods.
I couldn't setup multiplayer in Quakespasm outside my network (Wifi + LAN)