Welcome,
The two main differences between the two of them (besides the height/weight limits) are:
-The base of the Safeseat is just much nicer than the base of the Snugride. The Safeseat base has vehicle belt built in lock offs so you never have to to use a locking clip and there is a twist knob adjustable foot that is great for adjusting to the right angle. The Snugride base seems flimsy in comparison as the adjustable foot is manual and lots of people report that it will not stay in place so towels and pool noodles must be used to adjust angle and also no built in lock-off. The Safeseat base just seems easier and fast to install for most all people.
-Secondly, all models of the Safeseat come standard with front adjuster. Only the mid-higher end models of the Snugride have front adjust, the rest have rear-adjust. Rear-adjusting harnesses are not unsafe just more difficult to use correctly everytime. Usually they are too loose. By the time you pay $100-130 for a higher end snugride, you might as well have bought the base model of the Safeseat for the same price and got the extra weight and height limits.
As for which I recommend, it really depends on your needs. If you have a convertable seat to pass down to the baby, then a snugride might make more sense economically.If you need something really light, then the snugride would probably be better. If ease-of-use is key, I would say Safeseat. Also if you need the most bang for your buck, then the Safeseat could really work for you, as it lasts some smaller babies till 2 years and most to at least a year old.
The Snugride is really a tried and true seat, even with the base and if you had to get rear-adjust, it would still be perfectly safe as long as you read the manual, follow the directions, and make sure the harness is right every time.