As far as I know, the Razr is exactly like the Maxx except for the battery and thickness...firmware, other hardware, all the same, so...
I have a Rez (rooted) and my wife has the Razr (non-rooted, she won't let me); here are my thoughts/comparisons/opinions:
- Razr just feels ergonomically bad in my hand, too wide, flat and sharp-cornered
- Rez HD screen just blows the Razr away
- Rez switches between 3g/4g and wifi quickly and effortlessly compared to her Razr and gets better download speeds side by side (excluding wifi)
- Camera works fine on both; most folks claim Rez rules on this, but I'm not much of camera phone guy...they are fine in a pinch, but that's why I spent a grand on a good dslr
- Can't comment much on rootability of Razr(see above) but rez is acquiring more options in that department as more devs get involved, s-off was achieved; just waiting on someone to crack RIL or have source released...that being said, I like her stock motorblur better than stock-sense, which is why I rooted because I'm not much of a sense fan...too resource intensive
- My Rez works fine with FB, her Razr always has problems, so I think that is just hit or miss
- Talking in my car on bluetooth I experience the same issues OP mentioned...just thought it was related to my rooted ROM, as I thought it was fine stock, but I didn't run it very long before rooting, so that may be a Rez thing.
I bought the phones at separate times, and hers several weeks earlier without any input from her, but she absolutely loves the Razr (but she came from an Eris, lol). I couldn't own a Razr after buying it for her, which is why I went to the Rez (coming from an Incredible). All things considered, I would probably wait for the Inc 4g, or whatever it is called if I could do it all over again...even the Rez is just a tad too big for me at times.