Jasper is 4 mos old today! WOOT WOOT

So the DH and I have decided that he is now old enough and big enough to get either steps or a ramp for our bed. They also make one that is both. I am looking for your opinions and/or advice about which you believe is better. Also, if you think he may be too young or small. Two weeks ago he weighed 2.5 lbs. Since he loves his food and doesn't leave any extra at the end of each day...I know he weighs over 3 lbs. now.
Thanks for anyone who chimes in.