I couldn't say, but be aware that VM are in the process of switching mobile network provider from BT/EE to Vodafone. As a rule EE have better coverage and speed, but local reception issues are usually more important. If you have a poor signal with Voda at home, then VM's mobile deal may not be the one for you, regardless of price. A further fly in the ointment is that VM have announced a deal to merge with O2. If that goes through, then at some future date VM's mobile subscribers will be further ported over to the O2 network, although that's probably a couple of years or more away, depending on the break clauses in VM's agreement with Vodafone.
Of course, if you get great signal from all networks this won't matter, nor will it matter if you're going SIM only on one month contracts and don't mind the prospect of having to move all household phones to a new network.