Is Bluetooth less susceptible to jamming than wifi?
Bluetooth operates in the 2.4 GHz band using 79 channels, spaced 1 MHz apart, from 2402 MHz up to 2480 MHz.

Bluetooth is less susceptible to jamming than Wi-Fi since Bluetooth uses a technology called Frequency-Hopping Spread Spectrum (FHSS).  This means the signal "hops" from one channel to another, using a pseudorandom sequence known to both transmitter and receiver, 1600 times a second (every 625 µS).

In addition, Bluetooth also employs Adaptive Frequency-Hopping (AFH) which means it will only use "good" frequencies, and avoids "bad" frequencies, i.e. ones that are interfering with it.



So first of all, someone trying to jam a specific Bluetooth communication would have to be privy to its pseudorandom sequence, and then once the channel causing interference is detected, the jamming frequency would automatically avoided anyway.

Wi-Fi also operates in the 2.4 GHz band using 11 channels (in the US) spaced 5 MHz apart, from 2412 MHz to 2462 MHz.  Because the bandwidth of a typical Wi-Fi signal is 20 MHz, assigning a Wi-Fi signal to a particular channel makes adjacent channels unavailable (for example, channel 6 will spill into channels 5 and 7, and a little into channels 4 and 8).  So you can only get three non-interfering Wi-Fi signals in the same location: 1, 6, and 11.

Obviously, if you had a device that could jam the entire Bluetooth or Wi-Fi channels bands, such as this $5000 one, which is easier to jam is a moot point.  But assuming you are trying to jam a much smaller bandwidth, since Wi-Fi uses fixed channels, it would be easier to jam Wi-Fi than Bluetooth -- since if one jammed an entire Wi-Fi channel (20 MHz), this would tie up 20 Bluetooth channels, but the AFH mechanism would allow the Bluetooth to avoid these and use channels that were not blocked.