there's nothing to be frightened of about a pressure cooker, you just have to get used to using one. i used to have an aluminium prestige one and used it all the time, it was great. after about 20 years continuous use, the handle came loose and i stopped using it. eventually i binned it and never bothered buying a new one. now there's just the two of us to cook for i don't think i'd get the use out of one the way i used to. had a slow cooker too and found it totally useless, never got on with it at all but i know there are those who swear by them. mind you, there are those who swear by george foreman grills too and they're another horrible piece of kitchen kit, cannot abide the way they cook any food especially meat.
i think both are either wonderful or a waste of money, depending on who you ask. you'd probably have to bite the bullet and buy either or both and decide for yourself.