Kevs, you should really try both. A couple boxes of film will tell you more then we can, and it won't cost you much.
If you can get the range you need on a chrome, they're fantastic. For times when that's not possible, negatives are there for you.
Fluid mounting - you use fluid when mounting the film to a glass holder with the goal of increasing contrast and reducing the impact of scratches. SPI is short for samples per inch. Try googling SPI and PPI (pixels per inch) in relation to scanning as well as fluid mounting. They're fairly long topics.
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