Spence is far better for me, Jones has looked great at times but has nowhere near the consistency of Spence
Most games I've seen Spence (for Forest) he's gone missing, or been outshone by some of their other players. I like many took a keen interest once Forest started doing better, and the Spence hype increased.
I think he just gets hyped because of the cup run, which to me, looking at it objectively he didn't look that great in, not 15m great anyway. I think a lot of it is he stands out a mile on TV with the gangly frame/ dreadlocks etc. Most games I saw him for Boro it looked like he had some talent, but zero interest. Obviously Spurs have scouted him, and will have been more objective than the commentators, and seem to think 10-15m is more a fair price, rather than the hyped up price, which I think is fair enough.
Jones was great last year when Wilder came in, but clearly got tired/ knocks and just had to battle through as he was the only one creating anything, that's going to take it's toll, but he was still good towards the end and Spence was no better. Also, after 5-10 games or so of Wilder, teams set up to stifle Jones, as they knew we had little else, and were not going to attack from the other side.
Put Jones in a side which has more threats, and he can play a normal game, and you'll get a higher level out of him. Having Giles on the other side is really going to free up Jones this year, if it doesn't it means Giles will likely have more space or the middle of the pitch will be wide open, so it will be better for us, and make us less predicatble.