Having used film cameras for many years I suppose I’m a bit biased on this, and always use digital cameras rather than smartphones or ipad. (Only ever took 2 pictures on my smartphone ).
I find I can hold the camera easier, also the controls are designed for photographers, such as exposure compensation dial, rather than having to go into the complex and time-consuming menus.
Putting filters on a phone or ipad is tricky, but easy with a camera. I do point out, however, that some smartphones are getting to be similar to standalone digital compact cameras, and can produce very good results.
Attaching a quality flash to a smartphone is not really possible, you have to rely on the built-in flash, which has it’s limitations, but you can soften the harsh contrast by using folded white tissue paper over it, essential for good portraits and close-ups.
Taking a few thumbnails for your website is perfectly fine, for most phones and ipads. But digital noise is much more likely to show up on the tiny sensors of a smartphone, than a decent digital camera. But technology is improving every day.
Note that quality is not about how many pixels your phone or camera has.
It’s about the sensor design and size. And lens quality too.
If you take small pictures/images, you probably won’t notice much difference. Blow up your pictures, and you will, on a side by side comparison. If you don’t, you need your eyes tested !
I have largely moved over to a more compact camera system (Fuji) with interchangeable lenses, and the quality is fabulous, but was not cheap.
You need to feel comfortable with whatever you use to take pictures with. Some digital cameras out there I cannot get on with, they have been designed by programmers, not photographers ! Same is true with many smartphones.
So, in summary, you can do well with either a standalone digital camera (or film camera), or smartphone /ipad. Just make sure you know where all the controls are, and can hold it steady. Camera-shake or ipad-shake has ruined more pictures than anything else , so a tripod or similar is useful unless you set a high ISO speed.