Won the game on Hard with my trusty Stealth Cruiser A, almost breaking 6000 points. If you can believe it it was even my first hard run ever... man I love that ship.
Hacking (and Mind Control) are just OP. As you can see, there's nothing to write home about, my equipment is pretty crap. I was incredibly unlucky with the stores, both the Heavy Laser II and the Ion Bomb were found in ship battles. For the first 3 sectors of the game, I was traveling with my puny dual laser and small beam having to kill 2 shield enemies. I think I got Mind Control on sector 6, if you mind control the captain, the dodge rate goes to 0 and so even with shitty lasers you can reliably pierce through them. Then I got Hacking by the end of sector 7, just bad luck overall. Most of the time I had nothing to do with my scrap than just upgrade shields, I didn't even find Zoltans either. By the end battle I had 400 scrap and nothing to spend it on so I upgraded weapons to 8 even though I only need 5.
The Stealth Ship has what I consider 2 of the most OP things in the game, and they do really well in hard too. Long-Ranged Scanner is by far the best augmentation, with it you will kick the RNG in the gut and get the maximum scrap income every single game, very important on the higher difficulties. When I see it in stores early on I do anything to buy it, and my high scores are all runs with that augmentation. Cloaking was always considered good, but I was amazed at how many battles I would survive with barely any scratches just because of my cloak and dodge rate. Having cloaking is great for the end game of course and it also beats having to fly around with 150 scrap unspent hoping to get a good store. Ships on Hard seem to have much earlier shields, more weapons and are more often AI, in a way this benefits ships that have high dodge and rely less on attrition. The Stealth Ship A has the best engines with a 30% dodge rate right off the bat and on top it has Titanium Casing, making it pretty hard to hit.
I remember the old days when the Stealth Cruiser A was classified as D tier, I always had my highest score and a rare normal victory on it but I never considered it that good. Hell, I'd put it at A or S tier now.