I'm venturing into using points for airfare. I've only used SW points to book flights, never had enough anywhere else to do it before

Trying to wrap my mind around how and where to look. Especially with all the partner options.
I'm in practice mode waiting for flights for next year to be released, this way I have an idea of what I should look for when the schedule drops. It will be one-way ANC>PHL (or maybe ANC>SMF, alternate depending on how the routes and points work) so I started out with Google flights for a rough idea, AS seemed to have best prices cash so I started there and will branch out. Trying to understand the award space after following along here. If we want to fly First on AS it's min 30k AS points, but if it's a mixed carrier with AA, it's flat 25k AS. Same awards are 30k AA through AA.
First Q: What's the better value, figuring out how to get 25k AS or 30k AA? We've got none of either to start. (I forgot when they expired and totally missed keeping them active.

) But I believe we have transfer partners for both.
Second phase, when I started looking at both sites I noticed the AA award flight on AS's site doesn't show up on AA's site. For this date, all the awards shown on AA have multiple connections so at least 2 stops. When I look at the AS site the AA award flight is much better. It's only 1 stop, the first leg on AS the second leg a non-stop on AA. I can only find this flight for cash on the AA site.
Second Q: Does this happen? Is this what people are saying when it's easier to see space on a partner site? Does that sound like I could really book that on points through AS?
Would still have to work out later if it's better to just book the cash price through Chase using UR. For the date I'm looking at right now as an example, it's not, but maybe opening prices will make it a closer call. And I still have to look other lines. So much to think about