The listing on Decentralized Exchanges (DEX) as well as on Centralized Exchanges (CEX) helps to build up enough liquidity to trade ATS without much slippage.
The xDai Chain the home of the Honeyswap DEX and it is a clone of Uniswap. Therefore it has the same advantages and disadvantages as Uniswap, but benefits from the low transaction fees on xDai Chain. Creating pools, adding or withdrawing liquidity or simple swapping are almost free. The liquidity on this DEX is on the rise and the 1Hive community, which developed Honeyswap, is very active in the space, preparing several financial protocols - e.g. a borrowing/lending protocol called Agave which is a Aave fork.
Ethereum has several great and highly liquid DEX protocols - Uniswap, Sushiswap, Balancer to name a few - which are continuously improved, e.g. the Balancer v2, with a common token pool and multi-token pools not bound to 50:50. Balancer even offers mitigations to avoid impermanent loss.
At the time of writing, it is hart to tell which of the protocols is the best for ATS to get a listing and it will be up to the ARTIS DAO to decide which ones should be supported.
Being listed on a CEX helps all beginners as well as established traders to access the ARTIS ecosystem and even the first CEX listing should be on a well positioned one, with high reliability and security.
WhiteBIT, an Estonian company, could be such an exchange, with competitive fees and a broad range of trading pairs and trading tools. It also offers a fiat on-ramp and has potentially IoT token interested investors.
OKEx, a company registered in Belize, is offering a broad range of trading tools for professional traders and has fiat on-ramps. It has competitive fees and already some IoT related token activity.
A listing on a top CEX broadens the access for traders to access the ARTIS ecosystem and therefore it is paramount to be listed on one of the top tear exchanges.
Kucoin, Bitfinex and Binance are the top candidates on which ARTIS should become listed and after the trading is well established on the other exchanges, a listing of ATS will put ARTIS on par with the EWT and MIOTA.