Öland class is lighter and have 4 main guns vs 5 for the Fletcher (who also fire a heavier Shell) and the Fletcher should also be faster as well exist in much greater numbers and was available in early 40s vs late 40s for the Öland class and the Fletcher class at that Point was not the most powerful destroyer US had access to. For radar, US had access to centimetric radar while the best radar sweden had access to after the war would be imported British ones. Also I think US ships had more sophisticated fire Control systems than sweden could build on their own.
So I think something like this:
- Öland Advantages: More modern guns, need less crew and lighter and carry mines
- Fletcher Advantages: Heavier, battle proven design, good guns, excellent soft factors such as radar and fire Control, better AA with access to proximity fuse, faster and greater operational range.
I think the Fletcher would be the superior destroyer, it have alot of stuff going for it while the Öland is an unproven design, alot of the Fletcher class advantages is however based on the resources of USA.
Yea, Fletcher's were not notably sea worthy though, being a flush decker, and were restricted from the much rougher Atlantic. It was only marginally heavier then the Orland 1880-2250 empty/load vs 2050/2500).
Orland while having smaller main guns, had a higher rate of fire...which is not necessarily an advantage, but does mitigate it using a smaller caliber. But when one considers neither gun were purposed for going toe to toe with capitals, the minor difference in caliber is largely negligible against targets they were designed for) when you add in increase fire rate. However, the Fletcher's had 5 main's compared to the orland's 4. In this, i think Fletcher's at least equal, if not gain an advantage over the Orland's fire rate by the fact the Fletcher had more guns with which to fire (ok, only one more).
Fletcher's had 10 tubes compared to Orland's 8. seeing how DD's main armament back then was often it's torpedos, that does give the Fletcher an advantage...until you consider the state of US torpedoes through most of war.
Orland had a reinforced double hull, while Fletchers relied on the flush deck design for strength. Not really going to get into a debate about which one is would be better, dont really know. armor can be a tricky subject with lots variables, just pointing out the difference here that could give one an advantage over the other in a gun battle.
Im an American, Im biased, Fletcher was better...
for what it needed to do...which was long patrols in the relatively calm Pacific and carry insane amounts of AA, and needing to keep up with the newer and faster CV's (giving up some armor for that). It was not well suited for what the Orland was purposed to do, which was to patrol the extremely rough north seas and shallow brown water shorelines of the Baltic against subs and light surface vessels, and take a beating while doing it.
In that sense it's comparing apples and oranges. In a head to head fight, it becomes less clear. The Fletcher, despite your opinions, does not have a clear advantage. It has a marginal advantage that could easily be overcome by positioning, terrain, and overwhelming fire, and more reliable torpedoes.