Well I am a Redline fan so that is the brand I recommend.

ULX, a new name to me so I looked it up.
Claimed to use a non-synthetic base, curious.
I see from the site that ULX110 do 5w30 as well as 10w30.

Choosing 5w or 10w- depends on your climate and especially on cold start conditions.
If you keep your car in a garage and do not start it early on cold mornings then 10w is ok.
If you do a lot of cold starts, then go for 5w over 10w.
If Subaru recommend 5w30 for your area, then use 5w30 rather than 10w30.