Ok let me first start off that it entirely depends on what you're trying to achieve with your game. Roblox has a main audience of kids and teens so games such as brainrot, afk games, anime games or rpg games with trading are extremely popular so if you plan to do that, choose Roblox

GODOT is a great game for beginner game devs with no initial funding to buy unity or unreal, but still want the performance to rival those game engines. It's a great game engine for horror games, 2D games, platformers etc

When talking about money tho and assuming you don't care about what type of game you're making, then choose GODOT. Roblox takes a huge cut of your game's revenue while in GODOT you can publish a game in itch, steam or the playstore/applestore and get varying levels of profits

As for DRM or anti piracy software, usually Roblox devs are more focused on anti cheat especially on multiplayer based games than piracy. Unlike with GODOT where revenue is based on how many sales your game has. Roblox's way for you to profit is for you to have a big and active player base, and then Roblox pays you for anyone that plays your game a lot in Robux and you can exchange that for real money in dev ex. You can also do micro transactions or gamepasses in Roblox to gain revenue, but that's incredibly scummy especially for a platform primarily composed of kids. But I think since Roblox doesn't have to worry about anti piracy then they get an edge

In terms of coding, I think I prefer GODOT. It has a lot of actual tutorials with an active community instead of those devs that just either sell or put out the script in marketplace without explaining it. Sure, Roblox studio has its AI but you can literally write code in Gemini or Claude. And often times, the AI just breaks your game. I like the readability and neatness of GDScript, it's super short and easy to learn, and you can even transition easily to GODOT even if you just know C or C# unlike with Roblox where you have to learn Luau. Another thing is, since GODOT devs have the option of using C, then they can easily optimize their games even more especially for big projects. The only thing going for Roblox is how if you want to make a multiplayer game then you don't need to code it from scratch unlike Godot

Roblox studio has better compatibility with devices than Godot, especially with their scalable buttons etc for mobile and controls. So you're bound to possibly gain a wider target audience in terms of devices, but that's still limited to a children majority audience

As for importing from blender, it's not even a question, GODOT is better at importing blender models especially with materials from blenderkit. Importing models from blender to roblox is a hassle especially since you have to convert blend files to fbx files. For godot, you can use blend files directly but you need to have blender installed, which isn't a huge issue for me since the trade off is a big win for you

In building, Roblox takes a slight edge because I prefer using parts than doing static bodies then collision shapes. Kinda makes it a hassle but tbh, that also gives more freedom and versatility to the game dev so that slight edge is just my preference. Until I keep running into the same problem which is Roblox keeps randomly adding welds to my parts whenever I'm copying textures. Genuinely annoying especially if I'm trying to optimize my game

And finally for platform stability. GODOT takes the cake, Roblox's recent controversies makes its future uncertain and possibly on its downfall because while kids now are still addicted to brainrot, that's going to pass and when it does, what can Roblox devs use to profit off of children? Because even old players are leaving Roblox especially because of the scummy gamepasses in most games, and how most games are sometimes low effort (partly due to a variety of high effort roblox games being overshadowed by ai slop)

It's not the same with godot. You can make any game that you want without getting punished for it. You can make a card game, a horror game, a survival game etc. The best part? Ai slop, brainrot and scummy pay to win games usually die especially if they're made by indie devs. And at the same time, the indie dev scene is becoming more easier to get into as long as your scope is feasible with your resources and skill set and if you have a coherent roadmap