I can recommend
Crucial for both SSD and RAM. I have a 1TB Crucial SSD in my early 2009 17" MBP, and I've always maxed out all my Macs with Crucial RAM for around 20 years. Never any problems, and when you enter your Mac's year and model, they will select the proper RAM for you. Easy to replace both, and you might as well do that while you got your machine open. A good opportunity to blow out any accumulated dust as well. I have also used some SSDs in other computers from
OWC. They also sell RAM, but all my RAM has been from Crucial.
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El Capitan is the last "officially supported" OS for the 2009s. That's what I am using and happy with it.