I'm going to ask the question that for some reason nobody has asked you yet: What do you want to use it for?
if you want to be mobile with it - you need to purchase something that fits your level of mobility. Should it have a built in battery? Do you want to power it off your car or a car battery?
What frequencies? Are you doing microwave? SHF? Satcomms? VHF/UHF sideband?
Are you doing weak signal work?
How is your area for noise and strong signals? Are there nearby radio towers? Are you in the city?
What kind of antenna connectors do you want and how many?
Do you intent to transmit or just receive?
Are you DX ing?
Should your radio have built in digital decoding?
Do you want an SDR?
Do you care how your radio works? (superheterodyne, regenerative, crystal based, synthesized, whatever)
What do you intend your primary operating modes to be? Do you know?
This and so many more things will inform your decision. So here's a little about how i decide what radios I want:
My radio should always have several antenna inputs of different kinds if possible - I like to build antennas.
My radio should usually be pretty sensitive - I like hunting for weak signals
If possible it should handle strong signals and noise well, I'm near lots of radio towers and I'm in a rather rf noisy city --- BUT I'm also good at building filters/preselectors so I can deal with it if that's not a possibility.
I like flexibility with modes because I'm into Utility DX - so my radio needs to be able to do most or all modes in all bands, not just the standard ones either. This has led me to get an airspy hf discovery +. I like it a lot - but it gets a bit too sensitive sometimes and I need to pop in a filter.
I also have other radios - you should probably just accept that you're going to have several radios at some point in your life. We all do, each is good at it's own thing. Anyway - I'm sure I added to the confusion but hopefully it helps you ask the right questions. Also - if you're like me I highly recommend the airspy hf+ discovery. It's a in a whole other league, no sport even, from what an rtl-sdr is, or even a lot of commercial radios.