The best laptop means a little money thrown at the purchase. You need one that has strong graphics (separate GPU card in the laptop) and a high resolution screen of at least (1366x768).
I am temporarily running RF 6.5 on a cheap $300 Acer, but with only photo backgrounds, low visual settings, and marginal, but viewable framerates of about 20-30 frames per second.
I would be sure to follow the optimal recommendation as stated by Realflight.