Question about brick mortar

This is a wall which gets lots of rain on it. Need to repoint it so taking out mortar.
Should I use pre mixed lime mortar, if so which is best, as hubby wants to just use a sand and cement mix with no lime.
Thank you

If it is a house wall and it has lime mortar then you may find it is illegal not to use lime mortar. Otherwise sand mortar.

Any brickwork with lime mortar should be replaced with lime mortar.
The lime mortar is how the bricks "breath"
If you use cement mortar you'll seal in the moisture that's already in the bricks causing all sorts of damp problems, inside and out.
The damp bricks will freeze in the winter and the surface will "blow"
Next time you notice a blown wall on a house, take a look at the mortar. It will have more than likely been replaced by someone who didn't know what they were doing. Replaced with cement mortar when a lime mortar should have been used.
To advise otherwise is not a good idea, sorry.

Once you decide, try to get it match the existing colour already there.   I had "professionals"    !!!!! do my garage earlier this year, who were going to do that, but it doesn't.   Mrs Bouquet

Hello be careful handling lime mortar it gets very hot when mixing it  then it has to be left to stand