There's no denying, I get a lot of packages come my way because I order online all the time (especially from Amazon). Because of this, I'm constantly dealing with various parcel carriers delivering me packages. Over time I've learned which ones I like and which ones I dislike.
In the past I never had issues with FedEX. They'd normally ring the doorbell and require a signature for package. Lately they've gone downhill. Whenever I have a package delivered to me from them, they just drop it off at my door. They don't knock on my door or anything, just dropped it off and I never knew it came. I had my PlayStation Move controller, a few brand new $60 games in a box, along with Nintendo 3DS all dropped off at my door. Seriously, dropping off a package in an apartment building is not a good idea. They could have easily dropped off my packages at my apartment leasing office for security. I had a friend who had them deliver an iPhone waiting at the door. He never heard anything until he found out that FedEX attempted to deliver the package. He was angry because he didn't go anywhere, just that FedEX decided not to deliver (he had to call FedEX for re-delivery, took several hours).
The USPS will typically do whatever it takes to squeeze a package in my tiny mailbox. My old mailman use to put larger packages in my apartment leasing office so I could pick up (he did that for anyone who wasn't there). A few times a package was dropped off at the door, but usually they weren't anything that valuable. My new mailman is horrible. He's inconsistent with postal notices (either they go to the door or in my mailbox). Early on he was putting them in my apartment leasing office, but now he decides to force us to go to the post office to pick it up (keep in mind that my local post office is horrible with slow employees, extremely long lines, etc.). I left work early on Saturday JUST so I could pick up a package before the postal service closed (the notice said available for pick-up the next day). I go there and they can't find the package. They told me they'd call once they contact my mailman. Well, I get home and saw ANOTHER notice from my mailman for the same package, where he decided to re-deliver, and now tells me I can pick it up on Monday. UGH, he's making my life more difficult. I'm even more angry I lost out on making 2 hours of extra overtime money just to pick up my package. Also, his reason for the notice was delivery confirmation, but didn't even put that number on the slip (confusing my local post office), and he also claimed my package WAS delivered on Friday (when I never received it). I have more packages arriving and if he messes them all up, I'm likely to pay more to have UPS handle my packages.
UPS on the other hand is EXCELLENT most of the time. My only dislike for them is if they are late to deliver packages, they'll just drop them off at my apartment leasing office before it closes, and I have to wait the next day to get the package. Most of the time, if I'm not home they'll leave a notice (to pick-up at my apartment office). If I'm home, they'll knock on my door and I get my package from them (I knew a few of my UPS guys). Only one package ever got dropped off at the door, which was cheap clothing from American Eagle.
I've dealt with A-1 Courier and Lasership from Amazon. A-1 typically just drops my packages at the door and never knocks on the door, but I haven't seen Amazon ship from them for a while. Lasership was leaving packages at my door early on, but now they take them to my leasing office. I have yet to hear them knock when delivering packages. Only thing I like about them is quick. I'm dealing with a package from DHL right now, but I'll share more on that story later depending on how that goes.
Basically, the trend seems to be FedEX just drops anything off at the door, UPS rings the doorbell, and USPS tries to fit whatever they can in your mailbox.
Despite my disliking for FedEX and USPS, I still gotta deal with them with the amount of online ordering I do. Typically in my case, I ship small stuff from the USPS, and larger items always go UPS.