I get pretty good signal with my Motorola Razr, not to mention it's easy to use and durable (dropped it one 2 many times already! lol!) Honestly, can't compare the 2 because I haven't owned a Samsung Blast.Good thing to do would be to compare the models side-by-side in Cnet: http://www.cnet.com/4244-5_1-0.html?query=razr&tag=srch&target=nwhttp://reviews.cnet.com/cell-phones/samsung-blast-sgh-t729/4505-6454_7-32563632.html?tag=prod.txt.1Read user reviews as well cause they tell you a lot. Good luck with whatever you decide to get!
We always say moterola is the best.