I think many rec players should emulate Agassi.
The short backswing and the over the shoulder finish are good for rec players, IMHO. The two hand forehand is very reliable. I feel you can maintain these strokes without gigantic amounts of practice time.
I have found Feds WW style with LOTS of "door nob" twisting of the arm very hard to hit. FYB explained that Fed swings with a flatter trajectory but more of this door nob style pronation then most players. This is really really hard to emulate IMHO. His style with the Eastern grip combined with lots of pronation is TOUGH.
I would also say the OHBH is the more difficult shot compared to the two hander. Why? Well if you study Agassi there is an amazing symmetry (IMHO) with his forehand and two handed backhand. They are fairly close to being mirror images of eachother. This kinda of gives you double the practice. Whereas a one hand back hand is VERY different from a eastern grip "fed style" windshield wiper forehand.. The one hand backhand uses alot more linear power and much less rotational power. In fact over rotation is one thing that derails alot of OHBH. That is swinging around like a top on a OHBH..
If that wasn't enough like most pros Fed hits reverse forehands as well - which is a whole nothing thing to learn... This is shot that hasn't even been taught to me by any pros.. So good luck with that.. Then you need to learn an assortment of tough slice shots and lobs and a whole lot more..
The practice time involved in emulating Fed is GIGANTIC - and what is worse (and this is something few people talk about) Fed's great "variety" is a detriment to many players if they emulate.. That's right a detriment. Your not going to win being "okay" at dozens of shots. One dude who hits a nice simple topspin forehand - and backhand who can place the ball and hit with power is going to spank the fed wannabe 9/10 times IMHO.
Variety is only useful if every shot is hit at a very high level. Its all about execution. Mastering the basics is more useful then trying to mirror a master. Its like playing hoops - the dude with the sweet jumper and solid fundamentals is MUCH better to have on your team then the dude with the off-balance runners and funky "high release" jumpers who bricks half his shots..
Not sure who on the women's side you should emulate..Anyway fed emulation is likely bad for teh game much like how Johnny Mac emulation screwed up alot of players with his ridiculous serve stances and amazing touch..