Unless you have a laminate countertop, I don't know why you'd choose a top mount. The freedom of just wiping your crumbs and crud straight into the sink vs picking it out of the edges of the top mount speaks for itself.
Your second question is more complicated because it has to do with how you use a sink - not someone else, but you. Not only that, but people feel pretty strongly about their preferences. You just need to figure out how you use your sink and what your preferences are. This is a list I made to help a neighbor who is about where you are in the planning process. You may find as you read that you will have some AHA moments and recognize that a particular point of view resonates with you. IOW, there isn't a "right" answer, just an answer that rings true for you.
Really big sinks: https://www.gardenweb.com/discussions/2465743/does-anyone-have-the-galley-sink-how-do-you-like-it#n=67
Stainless Steel vs other types: https://www.gardenweb.com/discussions/2705122/anyone-regret-getting-stainless-steel-sink
Two large singles to make a large double? https://www.gardenweb.com/discussions/3679375/can-i-install-two-large-single-bowl-sinks-side-by-side
Best stainless steel sinks? https://www.gardenweb.com/discussions/4623870/who-makes-the-best-stainless-steel-sinks
Black granite (Silgranit) sinks: https://www.gardenweb.com/discussions/2670664/pros-and-cons-of-purchasing-a-black-granite-composite-sink
Best SS farmhouse sinks: https://www.gardenweb.com/discussions/3564493/what-is-the-best-brand-of-farmhouse-stainless-steel-sinks
Sink reveal, flush or positive: https://www.gardenweb.com/discussions/2663293/undermount-sinks-flush-or-reveal
Farmhouse sink? https://www.gardenweb.com/discussions/2456297/please-explain-the-allure-of-a-farmhouse-sink
Ledge sinks: https://www.gardenweb.com/discussions/2948796/ledge-sinks-and-accessories-do-you-use-them
16 gauge sinks: https://www.gardenweb.com/discussions/2705532/are-all-16-gauge-sinks-the-same
Sink grids? https://www.gardenweb.com/discussions/2974413/what-is-the-need-for-sink-grates-in-stainless-sinks
White sinks: https://ths.gardenweb.com/discussions/2626605/honest-opinion-on-white-sinks
What size sink in a 36" base? https://www.gardenweb.com/discussions/2690378/largest-sink-in-a-36-inch-sink-base
Drain placement: https://www.gardenweb.com/discussions/2685339/single-bowl-sinks-drain-centered-offset-pros-cons
50/50 and 60/40 divides: https://www.gardenweb.com/discussions/2678894/sinks50-50-or-60-40
Low divide sinks: https://www.gardenweb.com/discussions/2669873/what-are-the-pros-and-cons-of-a-low-divide
Sink price depending on where you buy it: https://ths.gardenweb.com/discussions/3955470/expensive-sinksworth-it
Cast iron farmhouse: https://www.gardenweb.com/discussions/4447916/33-kohler-white-farmhouse-sink-reviews
Silgranit vs stainless vs cast iron: https://www.gardenweb.com/discussions/2664181/sinks-which-type-silgranit-stainless-steel-or-cast-iron
More ledge sinks: https://www.gardenweb.com/discussions/3817452/kitchen-sink-decision-stages-vs-prolific-vs-something-else
Cleaning white Silgranit: https://www.gardenweb.com/discussions/4107932/reviews-on-white-silgranit-sink
60/40 vs single: https://www.gardenweb.com/discussions/2667336/60-40-sink-or-single-bowl
Sink & stove on same counter run: https://ths.gardenweb.com/discussions/2452373/sinks-and-stove-on-same-counter-run
Sink brand recommendations: https://www.gardenweb.com/discussions/5082431/what-are-the-best-sink-brands
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i like the gold streaks in the grey
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