I carry one speedstrip typically. Sometimes 2. Or one speedloader and sometimes I add a speedstrip with it.

Speedstrips are cheap and they break eventually with use. Buy a couple 2 packs. I have at least 4 and a few more I train with. Like 6.

Speedloaders are more expensive. I have one reliable one I keep clean for carry, one backup I do the same, and four I train with and don't mind dropping and beating up for each revolver.

For a grand total of 6 speedloaders and 6 speedstrips per revolver. I also do minimum 6 mags per semi if that matters. 2 for carry 2 for backup carry and 2 for training.