Conflicted between buying on steam for convenience or buying on PS5 for way cheaper

The PS4 trilogy is $37 right now for all 3 games and all DLCs. Just DS3 with DLC is $42 on steam. I wanted to buy it on steam to play on my steam deck, but it does feel kind of hard to pass on all the games and DLC for cheaper.

Anyone have the game on both or made a similar decision and have any thoughts on what they would recommend?