Basically, it's your choice.
Some info:
Per
this article about abstentions:
First, in parliamentary procedure land, an âabstentionâ is simply a voterâs decision not to vote. Itâs when a motion comes up for a vote, and (1) you donât want anyone to know what you think about that issue, (2) you disagree with the guy next to you but donât want him to know, (3) you arenât sure what you think, (4) you lost track of business a while back and donât know what the vote is about, or (5) you totally miss that a vote is happening because youâre thinking about golf. So you just donât vote.
Per
Roberts Rules of Order faq page:
The phrase âabstention votesâ is an oxymoron, an abstention being a refusal to vote. To abstain means to refrain from voting, and, as a consequence, there can be no such thing as an âabstention vote.â
In the usual situation, where the rules require either a âmajority voteâ or a âtwo-thirds vote,â abstentions have absolutely no effect on the outcome of the vote since what is required is either a majority or two thirds of the votes cast. On the other hand, if the rules explicitly require a majority or two thirds of the members present, or a majority or two thirds of the entire membership, an abstention will have the same effect as a ânoâ vote. Even in such a case, however, an abstention is not a vote and is not counted as a vote. [RONR (12th ed.) 44:1, 44:3, 44:9(a); see also p. 66 of RONR In Brief.]