My "Best Indoor" Antennas have been a 4-Bay Bowtie with Preamp hidden behind a big chair in my old apartment, a CM-4228 8-Bay Bowtie with Preamp in an upstairs closet I currently use and my son has a UHF CM-4228 with Preamp and a Hi-VHF YA-1713 Antennas in his Attic (technically still "indoors").
There is no such thing as ONE "Best" Indoor Antenna, even if we restrict the definition to those intended to be connected to the TV via a relatively short cord....and are small and hence LOW GAIN.
a) Except when VERY close to FM or TV transmitters, a Variable-Gain, Amplified Antenna is preferable for indoor use for two reasons: 1) if it doesn't suffer from Overload, the SYSTEM Noise Figure could improve by 5-10 dB, meaning it is more Sensitive and 2) an amplified antenna allows the designer to make a much better SWR match, thereby reducing not only the Mis-Match Loss, but also the Error Vector Magnitude (EVM) digital signal decoding Loss.
b) Many people have LOCAL towers located in several directions that NEED an Quasi-Omni (usually Bi-Directional) Antenna Pattern, which is typical of Rabbit-Ears+Loop Antennas.
c) Many people have reflected Multipath signals that NEED a Directional Antenna Pattern to suppress the unwanted multipath signals, which is typical of Silver Sensor LPDA (aka Terk HDTVa & HDTVi) Antennas. These people also MAY benefit from a Window mounted Antenna, such as a 2-Bay Bowtie.
d) Many people have lots of metal rebar in the walls and/or Aluminized Mylar Thermal "Wrap" and/or Low-E Glass with metallic coating, all of which greatly attenuates VHF/UHF signals....and hence need a LOT higher Antenna Gain than provided by simple Rabbit-Ears+Loop.