I am planning to apply for indemnity and have received quotes from the 3 major ones

Regarding indemnity
I am planning to apply for indemnity and have received quotes from the 3 major ones which are quite different and I am unsure which one to go for.
The quotes that I’ve received are:
MPS: £79
MDDUS: £116
MDU: £315 (!)
Out of the three, obviously MDU has a significantly higher rate but they were the only one to personally call me and discuss the coverage and the benefits. The person introduced themselves as my contact for any issues in the future should I choose to join them.
They also told that MDU provide ‘unlimited’ indemnity coverage, ie, will settle claims regardless of how much it is whereas others usually have a set limit. I could not find any information about this from the other two.
Personally, I liked the attention given by the MDU representative and am leaning towards them but their quote is just too much higher than the others, so I wanted to know if anyone has a better idea about what I should do.