I have The Sims 2 Ultimate Collection and I'm trying to decide if it'd be worth switching to the Legacy Collection or not. I already have a functioning version of the game, but I wouldn't mind redownloading all my mods. (It's been years and some of them have updates.)
(Main reason I'm considering this is because I'm having a glitch with the Apartment Life community story display. And I just wanna know if there'd be any real difference in terms of play experience.)

If you have the UC I'd in all honesty just stay with that. The gameplay is the same, however, the Legacy introduced more bugs than the UC has. Most of these bugs have been squashed by now thanks to the efforts of the community. But aside from that, the most important thing is that the Legacy version doesn't have the IKEA stuff pack, while the UC does. If you plan to use any CC that uses the official IKEA content you might run into compatibility issues.

Fortunately, the community has also fixed the IKEA stuff pack issue: https://github.com/hiloyt/the-sims-2-legacy-ikea
(Apologies if you already knew, I just wanted to be sure.)

What glitch are you having? It's possible that it can be fixed.

I fully plan on reporting it, I just need some more screenshots.

You'll find more bugs in Legacy than you will with UC, especially if you use any mods/cc. Exactly what is Apartment Life community story display? The only display items that came with AL are the know on wood shelves. And does the glitch exist with a vanilla game?

What I meant to say was "Belladonna Cove Neighborhood Story menu." It's a UI glitch.
Seems so.

I looked that up in Google and got this. AI, so take it with a grain of salt.

Based on community reports, a UI glitch in the Sims 2: Apartment Life Belladonna Cove neighborhood story menu often involves blank story pages, broken UI elements, or a failure to display the intended storyline images, sometimes appearing only as blank boxes. This issue is often related to missing neighborhood templates or corruption in the Storytelling folder.

Here are the known causes and solutions for the Belladonna Cove Neighborhood Story menu UI glitch:

1. Corrupted Storytelling Folder (Common Fix)

The most common cause is a corrupt or missing Storytelling folder, which holds the images for the neighborhood introduction.

Fix: Navigate to Documents\EA Games\The Sims 2\Neighborhoods\E001\Storytelling (where E001 is Belladonna Cove) and delete the contents. The game should regenerate them upon loading.

Alternative: If that fails, go to Program Files\EA Games\The Sims 2 Apartment Life\TSData\Res\Userdata\Neighborhoods\E001\Storytelling and copy those files into your Documents folder.

2. Missing/Incomplete Neighborhood Templates

If the game was not installed correctly (common in "Ultimate Collection" or pre-installed setups), the neighborhood may be missing its story files, resulting in blank pages.

Fix: You may need to reinstall or repair the installation. Using clean, pre-installed templates from community sites like MeetMeToTheRiver often fixes this, as the default Maxis installation can sometimes be flawed.

3. Mod/Custom Content Interference

Custom UI replacements (like "Clean UI") or mods that affect cameras can disrupt the story slideshow.

Fix: Remove your Downloads folder, delete the localthumbcache.package (if applicable), and test if the story menu works.

4. Other Issues

Pink Flashing/Graphic Glitch: If the menu is flashing, this is a graphical error, often requiring updating graphics drivers or using the GraphicRules Maker.

Unfurnished Apartments: Sometimes, if you enter a neighborhood without the neighboring apartments being furnished, it can cause general game stability issues, though this is less likely to break the Story menu specifically.

Key Advice: Always backup your Documents\EA Games\The Sims 2 folder before deleting files or testing new templates.

I don't think so. Afaik there's nothing in the Legacy edition that the UC doesn't have, on the contrary. I'm not planning on making the switch myself.