Hello, as the game comes with both wrappers for 3dfx and old direct3d, I tested them both and they work alright.
Are there any benefits in using one over the other ?
Having just quickly tried out, they look quite identical to me.

I've always had most success with Direct3D.

One distinct advantage is D3D supports 16:9 monitor resolutions.

3dfx is just a thing of the past, if you do not know what a Voodoo graphics card is then it is not for you. That was one competitor of that time.

I only found a Wikipedia site in German, but it is easily translated and should be fine.

https://de.wikipedia.org/wiki/3dfx_Voodoo_Graphics

Or a German tech site

https://www.pcgameshardware.de/Retrospektive-Thema-214694/Specials/3dfx-Special-zum-Todestag-des-Voodoo-Schoepfers-670247/

And here is a picture of the last graphics card Voodoo 5 6000 (a reconstruction on that picture, if I am not mistaken) they constructed, but its size was a bit too much.

https://www.pcgameshardware.de/screenshots/1020x/2021/02/1_11-pcgh.jpg

I'm very late to answer but I wasn't notified for the replies. I know enough about 3dfx don't worry, but thanks anyway for the effort. I was just wandering which was best because at the time there could be differences.

So it would appear that direct3d is the best choice, thank you both !

If you want scaled HUD, the best way is dgVoodoo 2. Put the game at 800x600 or 1024x768 and in dgVoodoo, set the highest 4:3 resolution that fits on your monitor (1920x1440 in my case).

Well my thread with 0 replies "you can bind third person to a keybind" answers this question extensively.

Here it is

-Direct3d mode is the best, it adds many new screen resolutions to the games videooptions menu, and its the only mode where no effects are missing at all. In glide mode the tiny 3d spiders on webs and insects are completely missing. And glide does not add any new resolutions into the actual game like direct3d does. No clue why.

If you look inside wot.ini you can see that direct3D clearly has the most graphical features compared to glide

[GlideDrv.GlideRenderDevice]
Translucency=True
VolumetricLighting=True
ShinySurfaces=True
Coronas=True
HighDetailActors=True
DetailBias=-1.500000
RefreshRate=60Hz
DetailTextures=True
FastUglyRefresh=False
ScreenSmoothing=True
Resolution=Default
DescFlags=1
DisableVSync=False
Description=3dfx Voodoo3

[D3DDrv.D3DRenderDevice]
Translucency=True
VolumetricLighting=True
ShinySurfaces=True
Coronas=True
HighDetailActors=True
UseMipmapping=True
UseTrilinear=False
UseMultitexture=False
UsePageFlipping=True
UsePalettes=True
UseFullscreen=True
UseGammaCorrection=True
UseDetailTextures=True
Use3dfx=False
UseTripleBuffering=True
UsePrecache=True
Use32BitTextures=False
DescFlags=1
dwDeviceId=0
dwVendorId=0
UseVSync=True
Description=Primary Display Driver
DetailTextures=False
UseAGPTextures=False
UseVideoMemoryVB=False

-The game reverts to glide renderer every single time the launcher is opened, you need to re-select direct3d every single time you use the launcher.

gog actually provides TWO different emulators inside the files for this game (wrappers but i like to say emulator)
-if you choose direct3D in the games launcher tool, the game will boot up using dxcfg.exe
-if you choose GLIDE in the games launcher tool, the game will boot up using nglide_config.exe
-each of these two tools contain additional video options such as scaling method/fullscreen/windowed.

You mean these spiders and insects?

Got all that with whatever size HUD I want through dgVoodoo. In the screens, I went with a 640x480 sized HUD while the game is running in 1920x1440 just to show an extreme example.

dgVoodoo behaves strangely, but it works out. I had to set Glide in the wot.ini, but that makes the game accept the DirectX emulation from dgVoodoo. Resolution in-game only matters for HUD size, you can force whatever resolution you wish through dgVoodoo. If I set D3D in the config, it seems like it's fighting with dgVoodoo and produces strange results. But it worked out in the end.

The HUD is the real problem the game has, because it becomes uselessly small on modern resolution. Yes, DirectX works without issues out of the box, but it has the HUD problem. dgVoodoo solves that easily. The only side-issue I've encountered is that cutscenes are a bit more squished horizontally. You can see it in the screens I attached here:
https://www.gog.com/forum/the_wheel_of_time/anyone_had_luck_with_dgvoodoo

An acceptable "defect" over a miniature HUD.