I am one of those that is still on the Chris L ship. He wins Ali's heart.
Of course I could be wrong (I've actually never been right on this show LOL) but I am planting my flag firmly in the Chris / Ali corner.
1. Ali's Blog : Her comments regarding Roberto are still of the "he's so hot" variety. Her comments regd Chris are very in the moment, teasing. There is no way they walked away from this show as just friends for her to be able to tease this much.
2. Also, from her blog, her various comments in interviews I do believe her story was not "done" because of Franks duplicity. Therefore I believe she picked someone and that someone is Chris.
3. And finally watching (and rewatching) her Fantasy dates with the 2 men...
Roberto - her BL was very off, not sure if it was all the sweating he was doing (sorry Roberto I can imagine it was darned hot) that kept her away but she seemed very cautious in her overall approach.
Now with Chris, the BL was off the charts. Best Overnight date ever on this show. She was pretty much melting with him (and with her, me in my living room watching). And her verbal responses to his suggestion that they could live anywhere where she said she was now re-considering Mass. plus her kissing him when he said he loved her is a sure sign she is not immune to ending up with this guy. Her BL itself was as though she was a woman in love.
4. The edit : They have shown a lot more of her time with Chris (more like an F1 edit like what Vienna got last season). If they were setting up for the next bachelor we would have got more shirtless short of Chris right ? But thats just my opinion.
Just a few of my current thoughts on the whole Ali/Chris saga

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