So far, its a no contest.
Botham and Flintoff are both excellent slippers and similar batsmen, though botham was a superior bowler.
Wouldnt call him devastating, as it would be an injustice to the word 'devastating' but he was good.
Keep in mind- Botham after his initial few years, declined rapidly- batsmen found him out and while batting,fast bowling was his nemesis.
Flintoff on the other hand, just keeps getting better and better.
This comparison would be better suited after 3-4 seasons, due to the diametrically opposite career paths of these two. Its akin to comparing Tendulkar and Lara in 95-96. Since Lara started with a bang and Tendy was slow to shine, back then it would seem like a no contest.
10 years after that, Tendulkar is either considered superior or in touching distance of Lara.
I personally dont think Flintoff would amount to much as he is quiete injury prone and his stats are mediocre despite him being already at his physical peak. The way i see it, Flintoff has 4-5 years left in his career and beyond that, it is gonna be one bumpy ride for him. That is about 40-50 tests more at max. Say he plays 35-40 more tests.
Would that be enough to bring up his stats to Botham's level ?
I am skeptical but we shall see