I've tried both, and currently have multiple bottles of steeped juice (as per my opinion).
Here is a quick summary of pros and cons about the companies and their juices, again, as per my opinion:
+ Vape Wild
-Shipping: Fast - Of the 3 orders I placed with them, all were shipped after 1-3 days of placing the order. Worth noting is the fact that I have placed both large and small orders with them.
-Prices: Very fair - Any company who charges <$20/120ml will tempt me to at least try their juices. Cost of shipping is also fair; they give you the option to choose how you want your order shipped (Pay more = Get it quicker, but you can certainly opt out of fast shipping and save some cash).
-Juice : Description: Above average - This is an issue that I've had with plenty of vendors. Their juices don't taste like how they were described. Of the 12+ flavors I've tried, not one tasted "off" or "strange". I wanted what I ordered, and received what I wanted.
-Juice (general): Above average - Simply put, their juices taste great. All of the flavors I have tried were mild to strong, with none being too weak or toned down. As far as I am concerned, they use quality ingredients.
-Overall: Great - I loved 9/12 of the flavors I received, enjoyed 1/12, and wasn't too fond of 2/12.
+ Mech Sauce
-Shipping: Below average/slow - My order from them shipped exactly 6 days after it was placed, and arrived 3 days later. If I recall correctly, many other forum members have mentioned that recently they have been bombarded with orders. That said, I like that on their Facebook page, they update their customers regarding which orders they have shipped.
-Prices: Outstanding - At $15/120ml, you cannot go wrong. They do not overcharge on their juices, like some companies do. Shipping is $5 or $6, flat rate (i.e. no shipping options - if this has changed, please feel free to update me).
-Juice : Description: Slightly above average - I found that some of their juices were not as described. After steeping for a week, they started tasting closer to their descriptions, but not how I expected. Either way, their juices taste close to how they are described, with some tasting exactly as described.
-Juice (general): Slightly above average - Some of their juices tend to taste muted, while others have a moderate amount of flavoring, and others an abundance. Their juices do not taste off/"peppery". As far as I can tell, they too are using quality ingredients. If they would bump up the flavor just slightly, my rating would easily jump up to an "Above average."
-Overall: Great - I ordered 6 juices from them. Loved 3, enjoyed 2, not too sure about 1.
I'll put it this way: Mech Sauce is the company that you order 120ml bottles from, once you've tried a fair number of their juices. Vape Wild is also that company, with the added comfort of knowing that there is a good chance that you will enjoy flavors that you've never tried from them.
Either way, both are relatively inexpensive, and both are worth trying.