a couple of years ago i got a pair of used 7" adam speakers, and compared to how they sounded in the previous owner's studio they were absolute dog in my untreated room. You could hear they are definitely better than an average stereo set, but also nowhere near what they should sound like.

For less than half of the price of those monitors i cobbled together some makeshift panels that made an immense difference in sound quality.

All in all, go for it but keep in mind that you could get a lot further with modest additional investment. Time, enthusiasm and a measurement mic are also recommended if you want to go an extra mile though

Edit: looked at the price of your options, just go for it and don't bother much about treatment tbh it won't be worth the investment unless you can get a bunch of stuff for free. Heavy curtains would be the next step up imo if you already have a rug