"better" is subjective.
With that said I do believe the saddles are very important in the tone and feel therefore, see this illustration for major points that make a difference:
Look at this pic that shows the what they're really comparing. I think this is the single biggest change to make:
I have experimented with 'vintage-width' saddles (some vintage saddles are pretty wide, others are very narrow and pointy at the top. so take that with a grain of salt), and the tonal difference was not that big to my ears. I guess you're implying that with slotted saddles you have a bit more surface area where the string is sitting? not really, unless the slots are very deep, which is not desirable. i have also tried soft-brass saddles. there was a small difference in tone, but honestly it sounded duller to me. it depends on the overall sound of the instrument - if it is very bright, go for soft brass, if it is super dark, maybe regular 'modern' brass or steel. most ABR-1 saddles are wide enough imo. there are some after-market ones that are literally knife's edge thin, I don't use those. i think stock Gibson ABR-1's give the best tone. I have a Pigtail ABR-1 that sounds good too.