I have a 14" HP Envy X360 (2in1) that I bought a year or so ago. With HP, the Pavilion line is their budget entry, the Envy the middle ground, and the Spectra line is their top of the line. There are a couple of things you definitely want to consider (and you already are). First, as noted if you are going to want to carry a laptop around, the smaller screens are definitely better/lighter. (I realize you are not). Second, the screens NIT rating is extremely important. Again, if you are going to use this indoor at your house 100% of the time, a 250nit screen is probably fine (although the Pavilion line is notorious for actually testing at lower than 250 nits). However if you expect to carry this around and might potentially use it outside or in front of large windows (at school, etc) a higher NIT screen is needed. My screen is 400 nits (and all the reviews actually say it tests at slightly higher numbers - around 430 nits) and it can be barely visible outdoors when it is extremely bright. A 500 nit or higher screen should be considered if you plan on using it outdoors with any frequency.
I like the 2in1 functionality but in addition to the general use around the house that the computer sees, I have a specific use case that works much better in tablet mode. I was specifically looking for a 2in1 because I knew I would be using it that way quite often. While it is handy to have the flexibility of the 2in1, I can't say I use it in tablet mode much outside of my specific use case. When I do, it is usually to watch a video and I'll fold it so that the screen is tilted normally, but the keyboard is tucked under the screen vs being in front of the screen like a normal laptop. This makes it easier to place the screen where I want.
