I assume by “traditional” you mean the pre-Vatican II Divine Office, because the pre-Conciliar Office comes in two major forms: the Roman Office (as prayed by secular diocesan clergy) which isn’t really traditional as it only dates to 1910, and the Monastic which is traditional because it dates back to St Benedict’s time (6th century). Both are very similar in structure but very different in the psalm arrangement, though the Monastic has a few extra elements added in. The liturgical year and classes of feast will be similar but the calendar different.
That said, the pre-Vatican II Office is more difficult. The liturgical year is more complex, there are more classes of feast (albeit somewhat simplified by 1960) and although nominally the psalmody is on a one-week cycle, the reality is that one is caught up much more in the festival psalter so as a result it really isn’t truly a one-week cycle as the festive psalms come up frequently, often more than once a week. There are so many feasts in the old calendar that monks joke that they have the strongest devotion to St. Feria (the fictitious saint of “ordinary” days). It becomes an anomaly then, that one is happier at ordinary days because they’re easier, and they come up so infrequently as to almost be something more special than the over-used festival psalter.
The new LOTH has the advantage of being designed for busy people and that gives the happy result that it is also especially suited to the laity. I have some experience praying the Monastic Offices; the traditional one still exists in post-Vatican II form, and there’s a modern one that is also on a one-week psalmody cycle, which would be comparable to the 1960 Roman Breviary in length (150 psalms per week). For busy laity, the LOTH is much easier. Moreover the LOTH isn’t as big a break with tradition as many think. There are some optional elements, in addition to the positioning of certain psalms, that do represent continuity with tradition (an example is the option to use Psalms 4, 90 and 133 at Compline every night, something that is not the case with the 1910+ Roman Breviary).