Obviously a very personal choice as to how much grain you find acceptable. If you're talking color neg there is no doubt that, generally speaking in terms of grain, the newer emulsions like 400UC and the like are as good and sometimes better than older color emulsions like Gold 100 (which I love but it is a tad grainy). Some say today's 400 speed films are the equivalent in grain to yesteryear's 100 speed films.
In terms of B&W there is simply too much subjective influence in regards to exposure, development technique and again, personal like or dislike of grain, to simply say which is better or worse or what is the potential for big prints.
If I wanted to I can develop Tri-X in a way that will look less grainy than Delta 100 depending on the character I want to bring out in each film and the grain I want using differing developers, dilutions, agitation techniques, etc. Oftentimes your technique and equipment will dictate your ability to print big when it comes to sharpness, your lenses, if you used a tripod, etc.