first off there are tons of different types of grease , some for high speed applications, low speed, higher temps, lower temps, food grade and so on
and it all can matter a lot on how long something last , pending what grease you use for the application
YES any grease is better than NO grease, but there NOT all the same
some grease become extremely thick and almost like NO grease in very cold temps, so, winter use grease is something you may want to make sure your using on a sled and then what part of the sled!
just think of it this way, grease in a wheel bearing spinning REALLY fast, needs to work and stay in place, differently, than say grease on a suspension part that moves a lot less over the miles!
for recommendation, ANY of the snowmobile brand marketed grease for SLEDS seems to work well
I prefer top use the Polaris grease myself, just easy for em to get locally and seems to hold up very well
I grease a lot of things, have I 3 grease guns all with different types grease in em, makes life easier when doing different things(heavy equipment, sleds, trail bearings, are my top things I grease often enough to justify having 3 filled and ready to go and labeled as such)