Plots that revolve around romance or quests and such based around them? Do you mean a heavy emphasis on romance? FE in general is pretty good at just letting the player decide on that, some of the games do have a character ship element to them but the player is not really forced into follow them. XBC games have the comical situation where one of the criticisms of the games is them not following romance elements that much, XBC2 in general has one infamous flip the table moment where people got notably annoyed at the main character.

You'll be fine in either game.

Nintendo has always made more money from software sales their business model is built around it hence why their prices are steady even after years on the market, since the NES their platforms have had a 30% license fee on all third party software. This software approach is why they tend to sit on hardware for as long as possible when the userbase is buying games, S2 likely has a 8-10 planned run as selling hardware in the long run is just as good as short term spikes for them we saw this with the 3DS.

Fire Emblem Direct tomorrow. Maybe I can get some more info on whether this game will be for me..

Does Nintendo make more money from hardware or from software these days?

Software, the answer is almpst always software.  If a platform holder isn't making most of their money on software, the model makes no sense to run most of the time.  

The margins on the Switch 2 are aparently very thin or negative.  First party releases can make a lot of money fairly quickly since there's no platform fees to pay.  Even without a juggernaut outside Mario Kart, Nintendo is still making by far the most money in their gaming division from software.

I don't think I've ever heard of a platform holder making more money on hardware than software lol

Always software even when we were in the era of profitable hardware the software raked in more money, Nintendo has always had license fees since the NES/Famicom as interestingly it was meant to be a first party only platform but Namco negotiated a 30% fee while Sony in the era of PS1 and PS2 didn't have license fees but made money on charging per disc printed as the format owner while the eras following they added license fees that are lower than the 30% Nintendo charges as I think they still make money off discs printed but as we're in the digital era and they're going full digital I imagine the fee structure is about to change. MS has fees as well although I don't know how much they charge, Sega would have had them as well I think their fees weren't percentage base but a fixed fee of $10 per cartridge however they were the most flexible when it came to them as companies could negotiate lower fees.

So the Switch 2 library isn't doing so good financially?

Dug this old relic out of deep storage for the first time since 2017 to see if it still works, fingers crossed

He's talking about margins on the hardware, the S2 is quite cutting edge meaning higher costs to make and the US tariffs and memory shortage increased costs post launch so the amount of money made per console sold is very small.