A balaclava with minimal odor resistance is fine if you're doing single-day outings and can wash it between uses. These are typically the most affordable options and work well for casual skiers who hit the slopes occasionally and have easy access to laundry.
The tradeoff is that untreated synthetic fabric will develop noticeable odor after just one active day on the mountain. If you're planning a multi-day ski trip, this becomes a real problem—you won't want to put it back on for day two or three. You'd either need to pack multiple balaclavas or deal with the smell.
If you mostly ski day trips at your local hill and wash your gear regularly, a minimal odor resistance option can save you money without much downside. Just don't make the common mistake of packing only one for a week-long destination trip—you'll be shopping for a replacement by day two.