[SDL] SDL vs Allegro

[Guido Billi]

Hi, 

I "love" SDL, but I am also looking around for alternatives!
so the question is...

Why should I continue using SDL instead of Allegro?

I don't have the time to learn Allegro as deep as I know SDL 1.2.11,
and I know that SDL 1.3 is coming, but...

I have seen that Allegro goes with a lot of native routines (GUI, font etc).

Is there someone that have tested both Allegro and SDL (+SDL standard libraries
like SDL_mixer, SDL_net, SDL_graph, ecc)?

Is there someone that could give me some informations about where Allegro is
better than SDL and where SDL is better than Allegro?

In particular... 
- is Allegro more efficient in 2D blitting without hardware acceleration?
- are Allegro bitmaps less expensive than SDL Surfaces about RAM usage?

Thank you for your time, and excuse me for my English 

Guido