Sorry - but neither would be my choice.
I prefer a single stone of a substantial size. ;)
I will say be aware that white gold will not stay looking bright and silvery for long. I wish I had known this before I got my engagement and wedding rings.
White gold IS gold, but has to be plated with rhodium (?) to give it that bright finish. Mine get cleaned and re-plated annually. After a few months I notice that they begin to 'yellow' My engagement ring more so than my wedding ring. I suspect that the wedding ring is better quality. That was purchased in an independent jewellers (which is where I take both rings for their clean and replate). The engagement ring was from either Goldsmiths or Ernest Jones - can't remember .
If I could choose again I would go for platinum rather than white gold.