Canada
Mindbender - The only park I've been to in Canada is Galaxyland.
United States of America
Florida - Kumba. The coaster that got me into coasters and over my fear of inversions.
North Carolina - Fury 325. It's technically located in both states, but the station is in North Carolina so that gives me an excuse to mention an underrated coaster in the Carolina down below.
South Carolina - Swamp Fox. An insanely underrated wooden coaster that is Phoenix's Southern brother. Every single hill of this ride delivers anything from sustained floater to Skyrush-level ejector, all possible with modified buzz bars! The laterals on the last turn unto the brakes are also very intense.
Pennsylvania - Skyrush. Phoenix is a decently close second place for me, it was my 100th coaster credit and delivers a standing double up-double down maneuver midway, turns around and then performs four standing airtime hills in a row at the very end.
Georgia - Goliath. I've ridden both Goliath and Twisted Cyclone, both are great rides for sure. I got a ride on Goliath where the clamshell bar was 2 inches or more above my body, and man was it insane! I flew out of my seat on every single hill (especially the one before the turn into the brakes, and the dive into aforementioned brakes)! Also worth noting, the ride feels satisfying in terms of length (unlike Twisted Cyclone, which packs a big punch into thirty seconds but still feels incomplete) and has a spectacular setting as it travels outside the park, onto that beautiful pond, and comes crashing back into the gates.
Ohio - Maverick. Maverick is my #3 coaster overall, just behind Intimidator 305 and The Voyage. It delivers on so many levels; the launches are excellent, it's one of the most intense coasters I have ridden, the 95 degree drop literally yanks you out of your seat to provide insane ejector, the Stengel dives are madness, and there are two more sustained ejector pops throughout Maverick's diverse layout. The inversions are a nice touch that give some hang time, as does the tunnel and slowdown after the Twisted Horseshoe Roll. Maverick almost feels like two coasters in one to be honest, with the first half feeling something more like Twisted Cyclone and the second half reminiscent of Storm Runner.
Virginia - Intimidator 305. My #2 coaster overall, it was my favorite before I rode Voyage the following June. This coaster is SO INTENSE!! I know you all have heard (or experienced) blackouts on this coaster, but I was fighting for my consciousness aboard that first turn and it was so gratifying when I won the battle. What followed was a coaster containing S-curves with laterals that made Maverick's "intense" transitions into laughingstock, relentless pacing and even a pop of ejector airtime somewhere on the return run! I love this ride so much!
Indiana - The Voyage. It may be rough, but the roughness only adds to the out of control wooden feeling for me! The triple down's third drop ALWAYS caught me by surprise on every single one of my 9 or so rides on this coaster, and the return run is also incredible with both crazy laterals and bonkers ejector airtime! The first half has good floater air but nothing to rival Mako's, the second half is very turbulent and has great, constant and whippy laterals with a few pops of ejector at the dips before the mid-course, and can I praise the third half again?! To sum it all up, The Voyage is my dream coaster turned into reality.
Texas - I've only been to Six Flags Over Texas, but that might change this summer as I may be able to go to Six Flags Fiesta Texas thanks to the very generous rep at ACE Winter Warm-Up (He gave all of us free tickets for the 2019 season, Flash Passes included with one per each major ride)! New Texas Giant has a great first half that keeps getting better and better, from the awesome first drop only amplified by the great Gerstlauer restraints, the high-flying overbanks with some whip to them and then the insane standing ejector hill (best moment of the ride) right before you jump up into the mid-course. The ride goes downhill from there, however, as the rest of the ride is basically a bunch of low to the ground manuevers that don't give airtime or forces but there are a few ejector pops at the end.