Most trout anglers in the East fish stocked water: a pond or lake in April, a put-and-take creek, maybe a bigger river later in the spring. The rod that covers all of that is a light spinning outfit, roughly five to seven feet long, with a small reel holding 4 or 6 lb line. Buying it as a combo is the easy way to get a rod and reel that are already balanced against each other, and it saves you matching the two halves yourself. This page ranks seven combos that fit that job. If you would rather pick the rod and the reel separately and go lighter, the ultralight gear guide does that instead.
The spec that matters most is rod power. Trout baits are light: a 1/16 oz inline spinner, a small spoon, a ball of dough bait on a size 8 hook. An ultralight or light rod throws those far and lets a 12-inch rainbow bend the rod. A medium-light rod gives up a little of that feel and handles bigger lake fish and heavier spoons better, which is why it is the most common trout combo on this list. Medium power is the top end: fine on a big river, too stiff for a small creek. Length comes second. Short rods cast under trees on narrow streams, longer ones cast farther from a lake bank.
Tom has not fished these combos. They are ranked from the specs on each Amazon listing and the ratings Amazon buyers left, and every rod length, power and reel size in the product names was read off that specific listing's variant, because most of these combos are sold in several sizes on one page. Three caveats. The photos on the two KastKing listings are the family's main image, which shows a larger 3000 reel, while the size ranked here is 2000, so check the size on Amazon before you buy. The Okuma Voyager's medium-light power comes from its VS-605-20 model code as listed by other retailers; the Amazon listing itself says only light-action. And the Ugly Stik GX2 has only 44 Amazon ratings so far, far fewer than the rest, so its score is an early read. Check the current price on Amazon before you buy.