there is not going to be one reply to this - everyone will have their favourite
for cold temps, measured by there not being frost or ice about, I use Thinsulate gloves, the sort you get from the market for a fiver or less.
If you can, try them on coz if lke me, you have long fingers, then the glove will not extend into the hollow between thumb and index fnger, that is not a problem uness you are cycling as the handle bar presses into that palce so the gloves will eventualy tear.
For colder temps, I have 2 pairs: berghaus and some other make - these have a thick outer one has a pair of removable fleece gloves inside. It can get quite warm in there meaning that your hand can sweat (remember you can only be cold but dry or hot and sweaty) so when removing the gloves, the inner can come loose and then can be quite difficult to push the fingers back into place. Look to pay upwards of £ 20 for this type. they are thick so it feel a bit awakward handling onto the bars.