"Top" is a very subjective term. EE are fantastic at my house for example whilst Vodafone is very poor, but when I'm at the office EE is hopeless and Vodafone is the best option. It's well worth trying other options, grab a PAYG SIM for each of the major networks and see what results you get.
Yup - where I am now I'm getting 60-80Mbit/s down on EE, 8Mbit/s on Vodafone (with a bit of messing about with position I might get that up to 19), most of the other networks are like 3Mbit/s unless they use one of the first 2. Where I work EE and VF are reversed and the others are so-so around 20Mbit/s.
Even then it isn't that straight forward - most of the area around my house/village only gets about 40Mbit/s on EE - but I found a spot in my bedroom where speeds basically double - I think because the walls of the house block out some sources of electrical/RF noise as the SNR jumps up from ~10db to ~20.
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