I agree that OTF doesn't suffer from EL reduction - to quote me, "your MF can't play 90 minutes of every game whereas your OTF can."
Another advantage with OTF is that you can coach it back to maximum in just 3 games, but your MF will take 6 games (probably more as he needs to rest) and might cost you the extra 25k each time.
On the other hand your MF's ShootingSL will go up by at least 5 giving him an extra 15% chance of being on target and an extra 10% chance of scoring.
Ball Control hmm? With a 5-2 advantage in MF your OFF and DEF can only increase by 11.25 with an OTF of 10. But with OTF of 7 they increase by 9 anyway. That doesn't include the basic OTF bonuses which increase OFF by 4.5 going from Normal to Ball Control if you also increase OTF by 3, and increase DEF by 1.5 The difference in MF and DF multipliers for DEF and also the loss of GP make this more difficult to compare.
In a high SL league, like SESL, Ball Control and OTF don't do enough for me. However in SaSo League One where we have an initial total SL of only 200 then things could be a lot different.
I expect to get thrashed by St Johnstone next season as I play 4-2-4 longball to your 3-5-2 Ball Control, Yoav