"Clunky" is definitively the word for Android
Let me elaborate a bit on this, and explain why "clunky" is the perfect word for iOS, and not Android (you're in total denial here, understandably, least you might feel foolish that your super expensive phone turned out to be merely grossly overpriced, and you were taken for a ride; reminds me of people who buy Bose surround-sound satellites/subwoofer systems and think it's hi-fi, not realising that Bose forces dealers, through their contracts, to never show and demo their stuff in comparison with other products).
Android, for a long time, has had a basic app registration policy (i.e. an app registers itself to handle a particular service or file type), and this meant that you had a lot of freedom in what to use with what, how to share and publish stuff. In iOS this was a late addition, and it's not quite as fully supported.
Android, from the very beginning, had a user-accessible file system. This is normal, it's an easy move from a computer, and it gives an extraordinary amount of freedom. You can just hook up an Android device to any computer - Mac included - and simply copy stuff in and out. iOS doesn't offer this, and it probably never will.
When I put music on my phone, I merely copy it from my NAS. When I put music on my iPad, I have to convert it to AAC, then transfer it into iTunes, then sync iTunes with the iPad. It's a pain in the ***, especially since iTunes is one of the most infuriating pieces of software I've ever had the displeasure to use. Just last week I wanted to copy more music on an iPod I keep in a car, and it stubbornly refused to do it claiming a "corrupted backup". There was no backup whatsoever, and I spent quite some time scouring the net to find a hidden command-line parameter that disabled the backup before sync. Why it wanted to back up the music I obviously already had on the computer, it's a mystery only iTunes developers know.
Take a basic use-case (I use my phone for business as well): someone sends you a document (as a mail attachment), you have to make some changes, then reply to the person and explain - in the message - what you did, as well as attaching the updated document. Easy stuff. Well, this was not possible on iOS without a lot of copy/paste hassle, for a long time, because iOS didn't allow the direct attachment of files. You had to mail files directly from the app you used to edit, but that meant that replying wasn't possible. To date, this is still partially true, since Apple doesn't allow attaching files unless they're from some net storage solution such as iCloud.
Or consider the multi-platform implications. Apple stuff works mostly in their closed eco-system. If you use several OSes - as I do - such as Linux and Windows, using Apple stuff makes everything harder. I can put Chrome on anything, sign into my account, and I have immediate access to bookmarks, my add-ons, saved passwords, everywhere. No fuss. Same for Google Drive.
If you noticed, there's a pattern here. One pattern has freedom, the other does not. No freedom results in clunky interaction with the platform. Sure, it will do basic, Apple-approved things easily enough. Move a bit outside of the Apple box, and you're in trouble on iOS.
When it comes to general OS interactivity and features, again, even with direct HomeKit control (i.e. solving a problem nobody has), there's just no comparison.
On Android, I can select text, and translation appears in the menu. In Chrome, I can select text, and slide up search results. I can reply to people directly from the notification. I have Now-on-tap, which means that if there's any mention of anything on the screen, I can get to it directly, be that on the web or in an app (e.g. it's a movie -> IMDB appears). I don't need to go into Settings to connect to WiFi, or Bluetooth. I simply long-press the buttons in the drop-down. To jump back between apps, there's the Back button. In easy reach, on the bottom of the screen. It's just so much more fluid and faster to do day-to-day stuff, there's no comparison.
iOS was designed from the beginning to basically present the user with a selection of apps, the user would click on an app, do stuff, click the home button, move to another app. Even as Apple has been scrambling to add more functionality to the launcher - mostly copying Android, unsuccessfully - this remains the basic flow. And it's very, very clunky.
