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I am looking for the best garden plants strains that are modified for faster or bigger yields. Are there any crazy ones that produce good results and I could possibly buy?
Ones that are modified in a lab specifically to prevent against certain pests, diseases, or environmental strain usually end up patented and sold by a single company only to large farms. Your best chance is to look for strains that were produced with intensive breeding for their yield and growth. Things like the tiny tim tomato would likely fit into that category. I believe it was dwarfed initially for use in commercial hydroponics but not sure on that.
If you are looking for yield on greens like lettuce or kale you should def look into a hydroponics system as those things can go a lot faster in water than in soil sometimes up to 50% faster depending on how much light they are getting (indoor vs outdoor).