What you can do with the TV is in the user manual.
What you can do with a PVR is not fixed, but depends on the PVR. So pick a few, download the user manuals and compare.
I have got a Samsung UE40KU6470 tv
If I don't use a PVR but instead use an external hard drive my question is this.
Will the TV software provide the same sort of information and be able to carry out the same sort of operations I would get from using a PVR. in other words do everything with the TV and hard drive that I would have done with a PVR