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The type 4 Nagler's have longer eye-relief than the type 5's so if you need comfort the T4's are the best option.
Optically the T5 Nagler's are superior to the T4's, although the differences are subtle and may not be apparent to inexperienced eyes. They have higher light transmission are slightly sharper and have better colour reproduction. This is to be expected because the T5 is a newer design. That having been said the T4 Naglers are an outstanding eyepiece and you won't go wrong with either the T4's or T5's, it depends on the things that are important to you.
CS-John B
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