Need some opinions pleaee

I'm trying to figure out what would be better to buy for my little one. He's 6 months and he's crawling and starting to sit on his own. I was thinking about getting him something to help with his sitting. But also so he can play. I was thinking if I should get him a walker, or like a jungle gym bouncer thing (not sure the proper name). I put pictures for example.

I feel like they'll both kinda do it, he might be more entertained with the gym one. But it doesn't move. And the walker would maybe help him to walk.

I've asked his Dr, but he's very old school and says to not get him anything. To just put him on the floor on a mat and let him use his environment to help him walk, holding to couches and stuff. Lol

So just wanted to get opinions on what you've all used, what did you find to help. Maybe get him something different to help with sitting?

***Update: I just want to clarify something, before I start getting hate. I have no problem with what his Dr said. He straight up told me that he's old school and doesn't like the walkers and stuff, he said the best way for them to learn is on their own. I like that he was straight up with me, I like the idea of him learning on his own. My original question wasn't about him walking, it was what I can do to help him to sit better. If maybe these might help or if I could try something else.***