C41 B&W filmas are okay if all you want is minilab prints on colour paper - otherwise, avoid them. Melvin Cambette-Davies (one of London's best B&W printers) one said to me, having printed some CN400 negs for me "Do yourself a favour, don't ever use that again. They've got no body. There's no silver in them. They are horribel to print." How right he was.
Portra 800 is great for people, good skin tones straight from the box so to speak. NPZ can make folks skin look like smacked bottoms so excessive is the magenta in it. Good printers will correct this and get a decent result - not your local lab. Too cold, too pink. Fine for non poeple shots. if looking for good skin tones, you or your printer will have to do a bit of work for them.