I am considering choosing a NS facing BTO unit facing a condominium's arrival plaza opposite the road vs a NE unit with unblocked view facing 200m to an expressway. Which is better? Thanks.

The north-south unit is priced about 75k higher and is a trade off between unblocked view vs lesser noise. I could only think of possible noise from the vehicles coming in and out of the condominum's entrance. Other than that, the north south facing unit could be a better choice despite being 75k higher?

There is no better unit is really up to personal preference. IMO, entry price is the most important factor.

Entry cost matters: If the highway‑facing unit costs S$75,000 less than the quieter facing unit, that is a direct saving which reduces your upfront exposure.
The saved capital could be used to upgrade the unit (e.g., soundproof windows, better finishes) making the highway‑facing unit comparable or even superior in quality-adjusted price.
Because your cost base is lower, even if resale value gains are somewhat muted (due to noise), your profit potential may still be as good or better due to the lower starting point.
From an investment perspective: Lower entry price means lower risk and potentially higher margin when the market appreciates.

I personally like unblocked views:

Clear unhindered sightlines
You get broader, more expansive views (cityscape, skyline, or landscape), rather than looking straight into another building.
This tends to give a feeling of space, openness and less “boxed in”.
It’s more pleasing, especially if the view is a factor for you.

Better daylight & sense of openness
With fewer or no neighbouring building obstructions, more light can get in (depending on orientation). The sense of openness tends to raise the ambiance of the unit.

My recommendation

Visit the site/unit at different times of day: Check how noticeable the highway noise is during rush hours, how constant the traffic sound is.
Check insulation and windows: If you pick highway‐facing, make sure the windows/doors are well sealed (double or triple glazing) so that noise/air‑pollutants are mitigated. Dakea+1
Evaluate orientation and setback: How far the highway is, what intervening buffers exist (trees, barrier walls) since that will reduce noise/impact.
Use the view to your advantage: If the unit has good height and is not blocked, ensure the outlook is something you like (city lights, skyline etc.) not just “a highway”.
Consider your lifestyle: If quiet evenings, open‑windows, low traffic noise are high priority for you (for rest, hosting guests etc.), then weigh if highway noise might bother you. If you’re okay with background hum and value the other perks, go highway facing.