くらいなら

1. 1Rather than do something undesirable, the speaker judges another course of action to be better or less bad.Ex. 1
2. 2Often with どうせ: if the action will be done anyway, the speaker recommends a better way of doing it (e.g. どうせ行くくらいなら、早めに行こう).

It is neutral in register and appears in both conversation and writing. The second clause is typically a judgment, suggestion, command or statement of will, such as ほうがいい, ほうがましだ, or a volitional or imperative form. Unlike plain なら, it is not a neutral condition. It weighs two courses of action, or, with どうせ, two ways of doing the same thing.

• ほうがましだN1「ほうがましだ」 comes at the end of a sentence and indicates that the latter item, though not ideal, is still the better choice; it often pairs with 「くらいなら」 and can also combine with 「よりは」 and the like. 「くらいなら」 introduces the rejected first item, so the two occupy different positions and cannot be swapped.
• むしろN2「むしろ」 is an adverb, typically used in the pattern 「AよりむしろB」, and it can also mean 'not so much A as B' — a meaning 「くらいなら」 lacks. With 「くらいなら」, the first item must be something the speaker is unwilling to accept, while 「むしろ」 has no such restriction; the two can be used together.
• というよりN3「というより」 can also be translated 'not so much A as B,' but it corrects a description or evaluation, saying B is more apt than A, and it can even be placed at the start of a sentence. 「くらいなら」, by contrast, expresses unwillingness to accept the first situation and a preference for the second, so the two cannot be interchanged.
• てまでN2「てまで」 attaches to the て-form of a verb or to 「名詞＋までして」, questioning whether the price paid for a goal is excessive; the following clause is often negative, and it can also describe someone going so far as to do something. It does not offer an alternative choice, so it generally cannot be interchanged with 「くらいなら」.
• ならN4「なら」 merely takes the first item as a premise on which to give a judgment or suggestion, with no element of choosing between options; 「くらいなら」 treats the first item as unacceptable and means 'rather than..., would rather...'. With nouns and な-adjectives, 「なら」 attaches directly, while 「くらいなら」 requires 「である」.
• ほどN3「ほど」 expresses degree (to the extent of...) or approximate quantity (about...), with no element of choosing between options; 「くらいなら」 means 'rather than..., would rather...'. The two cannot be interchanged — 「一時間ほどなら」 is simply a quantity expression plus 「なら」.

ほうがましだ and むしろ often appear in the second half of a くらいなら sentence to mark the preferred or lesser-evil option, whereas というより corrects a description rather than comparing choices. てまで stresses going to extreme lengths to achieve something, なら is a neutral conditional, and ほど expresses degree without weighing one option against another.