Which would you choose? 12k mile OCI with a 100% synthetic or 5k mile OCI with conventional

[Brian123]

I'd like to know what members of the BITOG forum would choose for their vehicles. (Let's assume that cost is equal.)

A. 12,000 mile OCI with high-quality 100% synthetic oil (such as Amsoil signature series, which is rated at 25k miles) + very high quality filter.
B. 5,000 mile OCI with generic conventional oil + average quality (low cost) filter.

All Highway driving, then A.

Short trip driving, then B.

What I would choose and what I actually do are 2 separate things. At this time in my life I am doing short trip driving, 1st was on PP and PU, and now I am doing Mobil 1 ESP.

 

[MontanaHandyman]

5k with synthetic

 

[JohnnyJohnson]

Neither April and October!

 

[walterjay]

If I had no other option than the 12K or the 5K interval I would choose the 5K. Because I have a GDI which gets the oil filthy and because all conventional oils meet spec for my engine.