Which oil to choose? Oil gurus, please, chime in!

[harp00n]

Hello! Trying to choose the better oil for my VQ35HR engine (I believe, it is similar in oil requirements):

- Motul Eco-Clean 5w30 C2 - "ACEA A5 / B5 / C2 - APPROVALS API SM / CF
RECOMMENDATIONS: Peugeot and Citroen HDi engines with or w/o Diesel Particulate Filter (DPF). ACEA developed ACEA C2 standard for lubricants with low friction, low HTHS (< 3.5 mPa.s), reduced Sulphated Ash, Phosphorus and Sulphur content (Mid SAPS). Do not mix with lubricants not ACEA C2 compliants."

- Motul X-Max 0w40 - "STANDARDS API SM/CF - ILSAC GF-4
APPROVALS FORD M2C WSS 937 A (FORD FOCUS RS 2.5 Duratec)
RECOMMENDATIONS NISSAN, JAGUAR, LAND-ROVER, FORD. Numerous OEMs such as NISSAN, JAGUAR, LAND-ROVER, etc… recommend to use a lubricant with 0W-40 viscosity grade and API SM for most of their sporty vehicles like for example the NISSAN GT-R, 370Z, 350Z,… MOTUL 8100 X-max 0W-40 formulation is the perfect balance between fuel economy linked to its
viscosity grade and outstanding lubrication (high HTHS > 3.5 mPa.s)."

There's explanation of HTHS here: Welcome to Motul , but the main question is which is better for our engines - low HTHS (< 3.5 mPa.s) - Eco-Clean or high HTHS ( > 3.5 mPa.s) - X-Max?