I can only speak as a recipient for the most part.
DPD, Parcelforce and Royal Mail in no particular order, though if I had to express a preference it would likely be for the latter as delivery times tend to be the same time on each occasion; DPD's tracing is narrower in delivery window, but it can be at any time of day.
The tracking works fine for me and estimated delivery times seem to be about right.
Yodel are a nightmare and Hermes can be.
Hermes particularly seems to depend on how seriously the local courier takes their job.
In Buxton our local Hermes courier is excellent, but I'm always concerned about their distribution network, based on past experience. (I appreciate you're not asking about Hermes, but just mentioning this for the benefit of others.)
Before you commit either way, I probably don't need to mention this to you, but again it might be of value to other readers; be very careful of parcel contents exclusions. Some of the couriers will happily carry your goods, but if you need to claim off them they will obviously need proof of cost of contents.
I've read numerous reports of one particular courier, who regularly lose parcels, and when the sender puts in a claim, they manage to interpret the description into one of their excluded items and thus refuse to pay out.
Also from your point of view, much of the perceived reliability will be down to the receiver's individual delivery courier.
Not a problem now we live in Buxton, but when we lived in Sheffield, I essentially refused to do business with any company which used Hermes or Yodel, as well as a couple of others (DPD was one, though they did improve).
I don't know how much it would inconvenience your business, but would it be possible to give customer's an alternative courier option, maybe at greater expense to be covered by the customer, if they know some of their local delivery staff are unreliable.
Bill
Edited By peak4 on 28/10/2020 21:48:01