I'd say both look fine to me. With turbos, at the entry end you have three main types. The low end of the market is like the one you mention where whilst there is a degree of resistance control, most of the time you'll change your resistance by using your gears. They also don't come with any speedos so you might need a bike computer to see how far you've gone and how fast etc. The next level up from that are the budget range from the likes of Tacx, who offer much of the above but with a computer headset to rest on your handlebars that ostensibly provides you with speed, distance, power etc. I used this for many years when training, but it requires a bit of mental discipline. 99% sure that you can't connect either of these up to Zwift or other services as they have no means of telling the computer how fast you're going.
That comes with 'smart' trainers, and whilst you can spend an absolute fortune on these, the budget end are not dissimilar to the mid-level trainer mentioned before, but they come with the ability to connect up with your computer via an Ant+ usb dongle. This then lets you plug it into stuff like Zwift, where you can not only do the training sessions, group rides, races etc. but ostensibly the trainer will automatically adjust the resistance depending on the terrain you're 'riding' in the game.
https://www.decathlon.co.uk/flow-smart-t2240-turbo-trainer-800-watts-id_8345488.html is probably about as cheap as you'll get for a smart trainer.
There are many that will complain about the accuracy of readout you get from the budget trainers, but for just starting out that's largely irrelevant.
One other thing I'd recommend, especially as Barcelona is pretty warm, even in winter, is a good fan. As you're static, you have no wind flow to cool you down, so you often sweat buckets. A decent fan is a must imo.