Food vacuum sealer and slow cooker verse pressure cooker

Hi I have two questions if anyone has feedback on

1) just wondering if anyone has a vacuum sealer? Do they really keep food fresher for longer, are they worth it, what brand do you recommend?

2) pressure cooker verse slow cooker. I love my slow cooker but constantly here pressure cookers are better, what's your thoughts if you have one? Was also looking at the beville fast/sooner cooker as a combined option, does anyone have one, would you recommend it?

Thank you