40 some odd years ago I had a little pressure cooker. Sat on the stove, jiggler kept it doing its thing and I LOVED it. Only reason I had to give it up was because the seal finally wore out and there were no replacements. I grumbled and whined for a long time, finally threw it out maybe 15 yrs ago. It made the best pot of pinto beans ever made.
My son in law bought an Instant Pot- brand Crock Pot. Has electronic function buttons, can make yogurt, has as many functions now as the microwaves now have. The recipes they suggest using it for I think need adjusted...it spends 97% of its time up on the fridge. When it gets used, I am the one to break it down and clean the jiggler, steam escape port, seal, etc. LOTS of parts. It is handy to have, it can cook dinner quickly, depending on what you are cooking. Soups and beans are great, but I do Not see anyone making yogurt in this house- that recipe is huge and there are faster ways to do that. I also don't care for searing my beef in an aluminum pan. We do have a slow cooker, occasionally gets used as well. Only 3 adults in the house, food is made in small bits because of different health issues and diets. The Instant Pot has a following because the kids weren't raised with pressure cookers and need recipes for that pot.
Advice? Sit down and figure out how many foods you are going to actually be using it for. A lot of the recipes come out with a ton of fluids so the pressurization will work right, so, you will have lots of fluids with your food as it is cooked.