There is no "best" CVVC reclist because it's...
1. Easy to create on your own if you know all the necessary sounds required for a language
2. There are multiple ways to make a CVVC reclist to suit your desired style
- There's the Delta list
@heta-tan mentioned
- There's the 2 mora list used by Canon, the voicer of Namine Ritsu (I personally use a modified version of this style)
- A self made list can be around 5-6 mora if the following pattern is done: kakikukekoko, kya_kyu_kyo
The oto and mic quality are what matter in terms of realistic results, not the reclist style. Just use whatever makes you comfortable.