Rear wheel 24 or 28?

[DeLuz]

I will be building some wheels for a new bike. Will be using WI T11 hubs and Pacenti 2015 rims.
My current bike has the same wheelset except with H2 hubs and has 20F 24R.
I weigh 140lbs and have had no issues at all with the 24 hole rear, but I am wondering if it would make sense to go with 28 for added strength and stiffness or will it not be noticeable?
The extra weight of 28g isn't a big deal for me if there is a benefit.

Thanks

[spdntrxi]

@140.. no reason to not stick with 24h..unless you were going to cross or something.