Whatever trimpot you choose, make the trim range as small as possible, it makes adjusting a whole lot easier and any
unwanted side affects are reduced by the same amount.
chuckb mentioned (minimal) wiper current, this may be more significant than any tempco if the trim range is fairly small.
I've used a 10x 1K ESI decade switch+resistors to create a divider with 1 thru 10 Volt tabs.
The resistors where already well matched but I also added parallel resistors (just regular metal film) to match them to within 50 ppm
and on top of that a 20 turn trimmer+network with approximately 70 ppm range to dial them within +/- 1ppm, the best I could do with a Wheatstone bridge configuration and a low res meter..
The trimmers I've used where jelly bean bourns 20x ones.
At that time I never did think of any minimal wiper current (and the smaller the trim range, the smaller the voltage drop, the less current..), but it may be good still as I don't have a high res meter to spot it from the output voltage.