After owning an express 20 gauge for around 3 years id def keep the nova, the 870 is quite roughly finished,trigger has about 1/8th of creep and if you breath on the "parkerizing" it rusts.. that being said it was cheap and as my dedicated turkey gun it works just fine.
On the other hand my full time waterfowl buddy has shot a nova for the last 10 years and that thing looks like new still. Hes had zero issues with it,even after falling in minus 20 water! Drained it out loaded her back up and we resumed the hunt!