The Stevens is likely the better rifle in and of itself.
However, the NEF Handi-Rifle offers some unique advantages: It is lighter weight, it breaks down into two pieces for compact transportation (and is a more compact firearm overall), and best of all, it is extremely easy to expand it's versatility by buying extra barrels for other calibers or for swapping between sights and scope without losing zero.
Accuracy on the NEF Handi-Rifles is quite excellent as well, if you read the range reports.
Honestly, I think I'd go for the NEF just for it's unique attributes/advantages.