BTC Unlimited Cash edition is "neutral" about the ABC/SV fork, meaning that the wallet supports both chains, AFAIU from the site
https://www.bitcoinunlimited.info/downloadBitcoin Cash (BCH) Release Candidate
Download the latest Bitcoin Unlimited Cash release candidate. (1.5.1.0, Nov 23, 2018)
(This software implements both the ABC and BSV Nov 15, 2018 protocol upgrades. For the activation of such features and BIP135 miner voting scheme see BIP 135 voting guide):
As a wallet user (not miner), i would like to know which of the two chains i am in, by default without changing any settings: ABC or SV ?