Hmm... that's a tough one as I own a few. Have a look
OK, if I have to make a choice. The best bass I ever played is my Oly White 60 Precision on the far left side. It's without a doubt the best bass I've played or owned. The thing plays like melted butter and even with all the mods I've done over the years, it still nails that old school P bass tone. With RotoSound's, it's the total 70's rock growler. Toss on flats and we're talkin Motown. Woody, pure, and round.
Second choice is the black n maple 08 MIA Precision. That thing has action that's sick low, plays clean everywhere and just plain kicks butt. The tone even with the stock Fender strings is everything you expect from a modern P bass. Punchy, with strong mids, and a nice fat bottom.
The 08 62RI and the 72 Telecaster II mudbucker are nice too, but they just don't get the playtime of the other two.
I used to have a 74 Ricky 4001 in Mapleglo and that WAS a great player, but alas, money issues forced me to sell it

I miss it to this day.