I am a colour neutral solver, I've been colour neutral since I started cubing about half a year ago and my suggestion is, if you are new to cubing, pick Colour Neutral, Opposite Neutral, or single colour cross dependant on what you feel you will do the best with. There are advantages with all of them.
Single Colour Cross users will quickly get used to doing "bad" crosses. I say quote it because it may be longer but it is not necessarily less beneficial than a shorter cross because after the cross, there is still 4 F2L pairs, OLL and PLL (Assuming CFOP). You could save that half a second from that longer cross from easier F2L pairs or less rotations of the cube. With single colour you also know exactly what pieces you are looking for and you know where they go regardless because rather than a filter the non-cross colour pieces out. From doing these bad crosses, when you do get a good cross you get much faster solves also. You also get "increased" inspection time and can plan for better crosses better because as you start inspection you ALREADY know what cross colour you are doing so you can look for the edge pieces, and lookahead to the first F2L pairs or plan Xcrosses because you have that "extra" time you spend looking for a good cross.
Colour Neutral, obviously you can look for all the crosses but this DOES take time, even if it is just 2 or 3 seconds, that is 2-3 seconds less to plan a cross. You get easier crosses more often than not but when you do get 6 non-obviously good crosses, you have to do a bad cross, and you won't necessarily be practiced for these bad crosses. For me, I've been colour neutral since the beginning so I am going back to single colours to work on getting used to bad crosses and practice forcing Xcrosses, then when I go back to colour neutral I will be able to pick up some easy Xcrosses I may not have noticed before.
Personally, I think Opposite Neutral is the best, it gets the best of both worlds and if you are opposite neutral from the start then it should work very nicely at least I think. It isn't that hard for people who struggle with colour neutrality but it's not that far of a step up from just a single solve.
Now, in response the the response video:
You literally have no idea how hard it is to switch when you are faster. You switched at 30 seconds, and now you are faster you are like, oh yeah CN is easy because I can do it, doesn't take too long to switch. No **** you can say it's easy to switch if you are CN already because we already can do it and we can see "everything". When you are fast, it is HARD to switch, and there is literally no proof that colour neutral is better. Ok, Faz and Rowe are colour neutral and they are ranked as #1 and #2 in the average rankings but look at the rest of the top 10.
3. Piti Pichedpan (ปิติ พิเชษฐพันธ์) - White
4. Cornelius Dieckmann - White
5. Giovanni Contardi - Orange
6. Michał Pleskowicz - Yellow/White
7. Breandan Vallance - Yellow
8. Kanneti Sae Han - Orange
9. Yu Nakajima - Blue (On Japanese Colour Scheme)
10. Mats Valk - Blue
The last I checked these were their cross colours, if I am wrong, whatever, most of them are still right nonetheless. Even if you continue down the only other colour neutral cuber for a while is Robert Yau. All of these CN cubers have been such from a very early stage. And there are no fast CN cubers that have switched from a single/opposite scheme and that has been said before many times.
Breandan IS trying to swap to colour neutral at the moment because he does not believe he will get any faster if he stays on yellow cross only. Only time will tell if he does get faster and we will be able to see how long it does take for him to get faster.
I'm going to go ahead and say, if you are not a brand new cuber, I would not recommend this at all, stick with what you know. If you are new then do try all colours, find which style whether it be a single colour cross, colour neutrality or opposite neutrality suits you best.