Not to contradict the above, but... If durability is a concern, the Jetstream is going to be far more durable that the 240 as far as snags. It's also sitkas windproof layer...the 240 from my experience is neither windproof nor durable and having had both they pack down very similarly. Assuming it's archery so pack space isn't really limited by a ton of cold weather gear, the extra 6oz is well worth it.
There is a reason the Jetstream jacket is easily the most popular soft shell in existence (on this site anyhow). The vest is no different.