An explanation of manual partitioning you might not find in either of them.
I can recommend that you try the text-based installer in standard mode (= non-expert)
The explanation recommended partitioning schemes is in the installation manual, but it is outdated. You might want to google for some more information.
If the text-based installer doesn't suit you, you can always bail out and run the GUI again.

jlinkels

Next time I will use text-based installer in standard mode. Where to get text of comments for Bootloader installation page(at the end of installation process), I just want to make sure I understand it correctly.

I used the expert mode once, about a year ago.

It would be very handy if you were setting up some unusual custom install or had some hardware that is very difficult to install on. I didn't find it too complex as I am a serial installer, should probably seek help for that problem, but it is pretty useless for a normal box.

As you are not a sick individual that installs things weekly for fun, using the expert mode could very well have been your problem. Would be very easy to click on something that shouldn't be clicked on.

Next time you install, give the graphical installer a pass too. It is identical to the normal installer but you can use your mouse. Sounds good. Not that great. Quicker to use the tab key to get to the buttons even in the graphical install. You have to type and you have to navigate. Using 2 tools for a job that only takes 1 means you are taking more time to do the job.

Or use the graphical installer and try not using the mouse. Be the same thing.

I think the only place you would notice a difference is in the ncurses check off lists like the sellection of software (tasksel - blue box) where I suppose you could use a mouse for sellections. Arrow keys to move up and down and the space bar to select or deselect an option.

Not sure why they ever added that graphical installer version. Kind of silly.

At least they haven't started inflicting a stupid slide show on us.

I am going to use one of the ISO editors someday to modify one of those if I can.
"Welcome to Cumquat Linux!!!!!! Did you know that you are letting a bunch of scripts make the install decisions about how to install on your box? Don't worry, be happy, we have this slide show to numb your mind for you. Please don't pay attention to what is happening to your drive(s)."

Experience, since I started to read and use GNU/Linux back in 2006, has shown me that, installers can be combersome and sometimes a hindrance. Debian happens to be the perfect blend for my preference of a distribution that gives the user ease of use and control. By 'ease of use' I do not mean, the promoted concept of rigidly being graphical and mouse based. Using text commands is also easy as long as there is accessible documentation that I can understand. For these reasons, I always opt to use debootstrap and chroot as they give me fine-grained control over what I install.