I find roses have different fragrance intensities depending upon weather, age of bloom and time of day. Tiffany always smells strongest and best to me early in the day or in somewhat cooler temeratures...spring and fall usually, instead of mid summer afternoon heat. In many roses , even notably fragrant ones like Fragrant Cloud, high heat and strong sun evaporate that fragrance off. Some roses are more reliably fragrant than others as a rule. There are so many variables that go into fragrance, even the perception of the nose doing the smelling! I find roses that other people describe as "powerful" or "strong" to barely register, and I find others to be more fragrant than usually described. If you grow a lot of roses, you'll likely find the same thing. That being said...Tiffany is not the most powerful scent in my opinion, its reliably there, but not as powerful as your Oklahoma...of which I am also a fan. Damask fragrances tend to be powerful, as are myrrh fragrances in some of the Austins. Tiffany is more of a blend of fragrances, instead of dominated by one key scent. I grow my Tiffany in a large container, give it plenty of water...which helps a lot, and fertilize with basic rose fertilizer in spring and summer. Some deliciously fragrant roses that I grow include Oklahoma...of course, with that damask power! Intrigue,with a strong, citrusy blend of scents and reliable. Fragrant Cloud, which is powerful, but the scent varies greatly and is fleeting in heat. Sharifa Asma, a very clean and pleasant smell, always strong. Tamora...for fans of myrrh, this one packs a punch! Prairie Sunrise, which is deliciously complex and heavenly. Tiffany, Maria Stern, which is decently strong and unique, Climbing Peace, very pleasant and reliable moderate tea scent, Blue Girl, one of my personal favourites, with a wonderful blend of scent...old fashioned rose almost. Hansa, great scent, but blooms do not last long. Double Delight, not a great plant as for disease or hardiness, but a strong smeller. I hope my long-winded response helped you out at least a little! Good luck!