Figuring out spoke length

I am in the process of getting all the parts to build new wheels (first time building) and have come across bit of a pickle. The build will be as follows:

32h H+Plus Son Archetype
Low flange Phil Wood's
Sapim Race spokes
DT Swiss Pro Lock nipples
3x cross on both wheels

Now, since I've never done this before and I am yet to acquire any components, I can't exactly do all the measurements myself. I'm using this calculator (https://leonard.io/edd/) and when I input all the details, it gives me 2 different results for spoke lengths. Spoke lenght left being 290.4mm and the right being 289.6mm. I can only assume that it's because on the rims, the spoke holes appear to be slightly offset from the centre. So which result is it then?

290 will be fine.
have fun!

Thanks for the answer. Will go for 290 in that case.

@adrevporn is right, 290 should be all right. I'm a little surprised that you have 2 different lengths (although the difference is minuscule). Is the hub track on one side only? I recommend that you read the guide by the ever so great Sheldon Brown:

http://sheldonbrown.com/wheelbuild.html

^ This is right. If this hub is assymetric (single-sided, not reversible) then there may well be a slight dishing required - so the spoke lengths are shorter on the drive side (what lenni confusingly calls 'right'). You haven't said if it's double-sided or not. If the hub is symmetrical, i.e. the flanges are equidistant from the over lock nuts, then you've made a mistake in your measurements.

By the way, there's a thread called wheelbuilding / wheel building help, the perfect place for your question.

If these turn out to be correct measurements, I would buy spokes of 288 for the DS and 290 for NDS. But that's just me.